Object reference??

[Guest]

I am trying to assign a value from DataItem to a variable but keeping getting "
Object reference not set to an instance of an object" error message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem)
{

DropDownList dd = (DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();
dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();
dd.Items.FindByValue(dr["Priority"].ToString()).Selected
= true;

}

}
}

 

[Hans Kesting]

I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Guest]

Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Karl Seguin]

e.Item.DataItem is null. The problem is you are checking for ItemType after
getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/

Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Guest]

karl thanks for your quick response.. after i moved the line of code inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

e.Item.DataItem is null. The problem is you are checking for ItemType after
getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/

Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

huzz wrote:
I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Karl Seguin]

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

karl thanks for your quick response.. after i moved the line of code inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

e.Item.DataItem is null. The problem is you are checking for ItemType after
getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/

Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Guest]

The repeater is binded to datareader

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

karl thanks for your quick response.. after i moved the line of code inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

e.Item.DataItem is null. The problem is you are checking for ItemType after
getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an object" error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Karl Seguin]

Try casting it to DbDataRecord (I think)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

The repeater is binded to datareader

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

karl thanks for your quick response.. after i moved the line of code inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

e.Item.DataItem is null. The problem is you are checking for

ItemType
after

getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but keeping
getting " Object reference not set to an instance of an

object"
error

message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Guest]

sorry karl i am very new to asp.net.. what is DbDataReader? can you show me
code?

Many thanks for your help

Try casting it to DbDataRecord (I think)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

The repeater is binded to datareader

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


karl thanks for your quick response.. after i moved the line of code
inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

e.Item.DataItem is null. The problem is you are checking for ItemType
after
getting the categoryName. However, if you are in a headerTemplate or a
footerTemplate, e.Item.DataItem will be null. Simply move that code
inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but
keeping
getting " Object reference not set to an instance of an object"
error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Karl Seguin]

string categoryName =
((DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();

it's in the System.Data.Common namespace, so either add

using System.Data.Common atop your file, or do

string categoryName =
((System.Data.Common.DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();


Karl


--
MY ASP.Net tutorials
http://www.openmymind.net/

sorry karl i am very new to asp.net.. what is DbDataReader? can you show me
code?

Many thanks for your help

Try casting it to DbDataRecord (I think)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

The repeater is binded to datareader

:

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


karl thanks for your quick response.. after i moved the line of code
inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

e.Item.DataItem is null. The problem is you are checking for ItemType
after
getting the categoryName. However, if you are in a

headerTemplate
or a

footerTemplate, e.Item.DataItem will be null. Simply move that code
inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but
keeping
getting " Object reference not set to an instance of an object"
error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected = true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Guest]

Karl THANK U SO MUCH.. its working now

just wondering why it didn't work with DataRowView.. and what is DbDataRecord?

Many thanks again for your help..
PS: your article on databinding is exellent..

string categoryName =
((DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();

it's in the System.Data.Common namespace, so either add

using System.Data.Common atop your file, or do

string categoryName =
((System.Data.Common.DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();


Karl


--
MY ASP.Net tutorials
http://www.openmymind.net/

sorry karl i am very new to asp.net.. what is DbDataReader? can you show me
code?

Many thanks for your help

Try casting it to DbDataRecord (I think)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


The repeater is binded to datareader

:

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


karl thanks for your quick response.. after i moved the line of code
inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

e.Item.DataItem is null. The problem is you are checking for
ItemType
after
getting the categoryName. However, if you are in a headerTemplate
or a
footerTemplate, e.Item.DataItem will be null. Simply move that code
inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a variable but
keeping
getting " Object reference not set to an instance of an
object"
error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected =
true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting

 

[Karl Seguin]

Thanks for the kind words, but clearly my databinding arcticle was missing a
key piece of information

As I say in the article, when you bind to a dataset, datatable or dataview,
the individual items are of type DataRowView.

What I didn't say, is when you bind to a datareader, the individual items
are of type DbDataRecord. DbDataRecord is the underlaying common type that
all rows of an DataReader (OledbDataReader, SqlDataReader, OracleDataReader)
are based on

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

Karl THANK U SO MUCH.. its working now

just wondering why it didn't work with DataRowView.. and what is DbDataRecord?

Many thanks again for your help..
PS: your article on databinding is exellent..

string categoryName =
((DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();

it's in the System.Data.Common namespace, so either add

using System.Data.Common atop your file, or do

string categoryName =
((System.Data.Common.DbDataRecord)e.Item.DataItem)["FaultDesc"].ToString();


Karl


--
MY ASP.Net tutorials
http://www.openmymind.net/

sorry karl i am very new to asp.net.. what is DbDataReader? can you

show
me

code?

Many thanks for your help

:

Try casting it to DbDataRecord (I think)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


The repeater is binded to datareader

:

What are you binding your repeater to?

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/


karl thanks for your quick response.. after i moved the line

of
code

inside
the if statement and now getting this message

"Specified cast is not valid. "

Line 64: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

e.Item.DataItem is null. The problem is you are checking for
ItemType
after
getting the categoryName. However, if you are in a headerTemplate
or a
footerTemplate, e.Item.DataItem will be null. Simply move

that
code

inside
your if statement:

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType ==
ListItemType.AlternatingItem){
string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();
...
}

should work

Karl
--
MY ASP.Net tutorials
http://www.openmymind.net/


Hi Hans

Here is the line no:
Line 57: string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();


:

huzz wrote:
I am trying to assign a value from DataItem to a

variable
but

keeping
getting " Object reference not set to an instance of an
object"
error
message.

what i am missing?

public void create_ddl(object s, RepeaterItemEventArgs e)
{

string categoryName =
((DataRowView)e.Item.DataItem).Row["FaultDesc"].ToString();

if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{

DropDownList dd =
(DropDownList)e.Item.FindControl("ddl");

if(dd !=null)
{
dd.DataSource = bs.drPriority();

What is "bs" ??

dd.DataTextField = "text";
dd.DataValueField = "value";
dd.DataBind();

dd.Items.FindByValue(dr["Priority"].ToString()).Selected =
true;

}

}
}

It would help if you specify the line the error is in.

Hans Kesting