to find id in gridview in asp.net

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sir,
i have following error when i am accessing the stateid in grid the error is

"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index"

error occured at line
"to.StateId1 = Convert.ToInt32(GdState.DataKeys[row.RowIndex].Value);"

C#

protected void btnDeleteState_Click(object sender, EventArgs e)
   {
       ClassMethods cm = new ClassMethods();
       ToContainer to = new ToContainer();
       int counter = 0;
       foreach (GridViewRow row in GdState.Rows)
       {
           CheckBox Chkbxstate = row.FindControl("chkchild") as CheckBox;
           if (Chkbxstate.Checked)
           {

               to.StateId1 = Convert.ToInt32(GdState.DataKeys[row.RowIndex].Value);//error at this line

               counter += cm.DeleteState(to);
           }
       }
       if (counter > 0)
       {
           lbldel.ForeColor = System.Drawing.Color.Blue;
           lbldel.Text = counter.ToString() + " States Deleted Successfully";
       }

       ShowGridState();

       //ClassMethods cm = new ClassMethods();

   }

please help me
thanx & regards
dnyaneshwar kawathe

Posted 14-Mar-12 1:28am

DNYANESHWAR KAWATHE

Updated 14-Mar-12 1:31am

Herman<T>.Instance

v2

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Herman<T>.Instance · Answer 1 · 2012-03-14T01:35:00

C#

foreach (GridViewRow row in GdState.Rows)
        {
            GdState.SelectedIndex = row.RowIndex;
            CheckBox Chkbxstate = row.FindControl("chkchild") as CheckBox;
            if (Chkbxstate != null && Chkbxstate.Checked)
            {

                to.StateId1 = Convert.ToInt32(row.SelectedValue);//error at this line

                counter += cm.DeleteState(to);
            }
GdState.SelectedIndex = -1;
        }