Add 1 new row for each row and then update all the records, but it JUST Update 1 / 2 records of Girdview ?

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C#3.0

C#

I Add 1 new row for each row in girdview and then update all the records, but it JUST Update 1 / 2 records of Girdview ? Any body Help me ?

This is my code:

//Add new row for or each row in girdview
// C#
       protected void gvUsersL_RowDataBound(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.DataRow)
           {

               GridViewRow g = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);
               //creating table Cells
               TableCell tCell = new TableCell();
               tCell.Text = table;
               //Add Cells
               g.Cells.Add(tCell);
               tCell.ColumnSpan = e.Row.Cells.Count;
               //Set Color for Empty Cell
               g.CssClass = "bgi_1";
               Table tbl = e.Row.Parent as Table;
               //add rows
               tbl.Rows.Add(g);
           }
        }

//Then Update:

for (int i = 0; i < gvUsersL.Rows.Count; i++)
{
//update here 
}

Any body Help me ? Thanks.