hi i have this code to add columns to GV from TXT

 if (GridView2.Rows.Count == 0)
        {
            dt = MakeTable();

        }
        else
        {
            dt = (DataTable)ViewState["dt"];
        }
        DataRow dr = dt.NewRow();
        dr[0] = lblname.Text;
        dr[1] = code.Text;
        dr[2] = qun.Text;
        dt.Rows.Add(dr);
        GridView2.DataSource = null;
        GridView2.DataSource = dt;
        GridView2.DataBind();
        ViewState.Add("dt", dt);
        code.Text = "";
        code.Focus();
        qun.Text = "";
    }
    DataTable MakeTable()
    {
        DataTable Mydt = new DataTable();
        DataColumn col1 = new DataColumn("Item BarCode");
        col1.DataType = System.Type.GetType("System.String");

        Mydt.Columns.Add(col1);

        DataColumn col2 = new DataColumn("Item Name");
        col1.DataType = System.Type.GetType("System.String");
        Mydt.Columns.Add(col2);


        DataColumn col3 = new DataColumn("Item Qun");
        col1.DataType = System.Type.GetType("System.String");
        Mydt.Columns.Add(col3);
        return Mydt;

and this code to delete from grideview

 Event : rowdeleting

  dt.Rows.RemoveAt((e.RowIndex));
        GridView2.DataSource = dt;
        GridView2.DataBind();

but when prss delete

error : There is no row at position 0. (if delete first row )

error : There is no row at position 1. (if delete second row )

...