ASP.NET error message

The code listed below only works on the line, "string id = ((TextBox)DetailsView1.FindControl("TextBoxAttid")).Text;" regardless of the order I place the lines of code.

When I step through code and get to the other lines of code, I get the error message

"Object is not set to an instance of the object". The only object I think this error is referring to is the detailsview object. However that is not the error.

Thus can you tell me what object the code wants a new instance of?

if (DetailsView1.CurrentMode == DetailsViewMode.ReadOnly)
{
string id = ((TextBox)DetailsView1.FindControl("TextBoxAttid")).Text;
}
else if (DetailsView1.CurrentMode == DetailsViewMode.Edit)

{
string name1 = ((TextBox)DetailsView1.FindControl("TextBoxAttid")).Text;
string name3 = ((TextBox)DetailsView1.FindControl("Invalid_Form")).Text;
string name2 = ((TextBox)DetailsView1.FindControl("Prior_Cutoff_Date")).Text;

}

1 Reply

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Narayan15y ago
Accepted answer
Try handle it safely with a null check and make sure you have given correct control names and typecasting them to a valid type
        if (DetailsView1.CurrentMode == DetailsViewMode.ReadOnly)
          {
            TextBox txtAttid=(TextBox)DetailsView1.FindControl("TextBoxAttid");
            string id = txtAttid!=null? txtAttid.Text : "";
          }

Similarly you can do it for others , try to put a breakpoint and debug you will see one of the values is null, thats why you are getting that error.
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