I got the error when i have load the data from gridview row command
i have to load the textbox data from datatable then i got the error
AjaxControlToolkit.DLL!AjaxToolkit.ScriptControlBase.OnPreRender(System.EventArgs e)
My code is below
if (e.CommandName == "Edit_G")
{
// std_id = Convert.ToInt32(e.CommandArgument.ToString());
std_id = 3;
college_id=Convert.ToInt32(Session["college"].ToString());
academic_year_id=Convert.ToInt32(Session["academic_year"].ToString());
edit_student(std_id,college_id,academic_year_id);
}
public void edit_student(int std_id,int college_id,int academic_year_id)
{
DataTable dt = new DataTable();
StringBuilder strBldr = new StringBuilder();
strBldr.Append("sp_student_registration");
SqlParameter[] sqlPrmt = new SqlParameter[]
{
new SqlParameter ( ...
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