GridView CommandArgument Guid error

[Paul]

In GridView if I make the CommandArgument of a link button a string created from
something like myGuid.ToString() the RowCommand handler dies with an error I
can't track down. The only thing I know is if the CommandArgument is a string
representation of an integer like "42" the error doesn't happen. The argument is
correct in the handler, I can use it by converting it back to Guid, but then I
get the error.


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Input string was not in a correct format.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can be
identified using the exception stack trace below.

Stack Trace:

[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer&
number, NumberFormatInfo info, Boolean parseDecimal) +2725283
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo
info) +102
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean
causesValidation, String validationGroup) +1143
System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) +199

System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +174
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +5102