Operating Checkboxes in the Gridview

Hi

Here is code to this

                                OnPageIndexChanging="gridviewSRHeaders_PageIndexChanging" OnRowDataBound="gridviewSRHeaders_RowDataBound">
                               
                               
                               
                                   
                                       
                                                                                            ToolTip="Select all Service Request" AutoPostBack="true" runat="server" />
                                       
                                       
                                                                                            ToolTip="Select Service Request" runat="server" AutoPostBack="true" />
                                       
                                   
                                   
                                  
                               
                               
                               
                           

  protected void cmbAllSPs_OnCheckChanged(object sender, EventArgs e)
    {
        CheckBox selectAllProductsCheckBox = sender as CheckBox;

        if (selectAllProductsCheckBox != null)
        {
            if (gridviewSRHeaders.Rows.Count > 0)
            {
                foreach (GridViewRow row in gridviewSRHeaders.Rows)
                {
                    if (row.RowType == DataControlRowType.DataRow)
                    {
                        CheckBox selectProductCheckBox = row.FindControl("cmbSRequest") as CheckBox;

                        if (selectProductCheckBox != null)
                        {
                            selectProductCheckBox.Checked = selectAllProductsCheckBox.Checked;

                            if (selectAllProductsCheckBox.Checked)
                            {
                                SetSelectedRowProperties(row);
                            }
                            else
                            {
                                SetUnselectedRowProperties(row);
                            }
                        }
                    }
                }
            }
        }
    }

    ///

    /// Select or Deselect a single product record from the Product GridView based
    ///

    protected void cmbSRequest_OnCheckChanged(object sender, EventArgs e)
    {
        CheckBox selectedProductCheckBox = sender as CheckBox;

        Control control = selectedProductCheckBox.Parent;

        if (selectedProductCheckBox != null)
        {
            foreach (GridViewRow row in gridviewSRHeaders.Rows)
            {
                CheckBox checkBox = row.FindControl("cmbSRequest") as CheckBox;

                if (checkBox != null)
                {
                    if (checkBox.UniqueID == selectedProductCheckBox.UniqueID)
                    {
                        if (selectedProductCheckBox.Checked)
                        {
                            SetSelectedRowProperties(row);
                        }
                        else
                        {
                            SetUnselectedRowProperties(row);
                        }
                    }
                }
            }
        }
    }

Thank you