row created event is fired on button click event.

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ASP.NET4

Hi friends

This is my row created event code

protected void classmarkgrid_RowCreated(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.Header)
            {
                string examname = examdropdown.SelectedItem.Text;
                if (examname == "AdmissionNumber" || examname == "Rollnumber" || examname == "Name")
                {

                    CustomizeGridHeader1((GridView)sender, e.Row, 2);
                }
                else
                {
                    CustomizeGridHeader((GridView)sender, e.Row, 2);
                }
            }
        }

private void CustomizeGridHeader(GridView timeSheetGrid, GridViewRow gridRow, int headerLevels)
        {
            for (int item = 1; item <= headerLevels; item++)
            {
                //creating new header row
                GridViewRow gridviewRow = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);

                IEnumerable<IGrouping<string, string>> gridHeaders = null;

                //reading existing header 
                gridHeaders = gridRow.Cells.Cast<TableCell>()
                            .Select(cell => GetHeaderText(cell.Text, item))
                            .GroupBy(headerText => headerText);

                foreach (var header in gridHeaders)
                {
                    TableHeaderCell cell = new TableHeaderCell();

                    if (item == 2)
                    {
                        if (header.Key == "AdmissionNumber" || header.Key == "Rollnumber" || header.Key == "Name")
                        {
                            cell.Text = "";
                        }
                        else
                        {
                            cell.Text = header.Key.Substring(header.Key.LastIndexOf(_seperator) + 1);
                        }
                    }
                    else
                    {
                        cell.Text = header.Key.ToString();
                        if (!((cell.Text.Contains("AdmissionNumber")) || (cell.Text.Contains("Rollnumber")) || (cell.Text.Contains("Name"))))
                        {
                            cell.ColumnSpan = 1;
                        }
                    }
                    gridviewRow.Cells.Add(cell);
                }
                // Adding new header to the grid
                timeSheetGrid.Controls[0].Controls.AddAt(gridRow.RowIndex, gridviewRow);
            }
            //hiding existing header
            gridRow.Visible = false;
        }

In this event I bind the data to gridview with splited column. after that i want to read the data from gridview for saving data to database in save button click event. but before fire button event, once again row created event is fired. so my gridview has lose the inserted the data before going to save. how can solve the problem. I am binding the gridview before call the save button event fire