how to use grid for edit data ?

<InlineFormModeTemplate>
                                  <div style="font-family: Tahoma; font-size: 12px;">
                                      Edit the values
                                      <br />
                                      <br />
                                      <table>
                                          <tr>
                                              <td>
                                                  Customer ID:
                                              </td>
                                              <td>
                                                  <%--<asp:TextBox ID="CustomerIDTB" runat="server" Enabled="<%#Container.CurrentRecord is GridRecord ? false : true%>"
                                                      Text='<%#GetFieldValue("CustomerID", Container)%>'>
                                                      </asp:TextBox>--%>
                                              </td>
                                          </tr>
                                          <tr>
                                          </tr>
                                          <tr>
                                              <td>
                                                  Contact Name:
                                              </td>
                                              <td>
                                                  <asp:TextBox ID="ContNameTB" runat="server" Text='<%#GetFieldValue("ContactName", Container)%>'>
                                                      </asp:TextBox>
                                              </td>
                                              <td>
                                                  Company Name:
                                              </td>
                                              <td>
                                                  <asp:TextBox ID="CompNameTB" runat="server" Text='<%#GetFieldValue("CompanyName", Container)%>'>
                                                      </asp:TextBox>
                                              </td>
                                          </tr>
                                          <tr>
                                              <td>
                                                  City:
                                              </td>
                                              <td>
                                                  <asp:TextBox ID="CityTB" runat="server" Text='<%#GetFieldValue("City", Container)%>'>
                                                      </asp:TextBox>
                                              </td>
                                              <td>
                                                  Country:
                                              </td>
                                              <td>
                                                  <asp:TextBox ID="CountryTB" runat="server" Text='<%#GetFieldValue("Country", Container)%>'>
                                                      </asp:TextBox>
                                              </td>
                                          </tr>
                                      </table>
                                      <br />
                                  </div>
                              </InlineFormModeTemplate>

Protected Function GetFieldValue(ByVal fieldName As String, ByVal container As GridFormEditCell) As String
       Dim editRecord As Record = container.CurrentRecord
       Return editRecord.GetValue(fieldName).ToString()
   End Function

   Public Sub GridGroupingControl1_BarButtonItemClicked(ByVal source As Object, ByVal e As Syncfusion.Web.UI.WebControls.Grid.Grouping.ButtonBarItemClickEventArgs)
       If Me.GridGroupingControl1.TableDescriptor.FormEditMode <> TableEditMode.UseTemplateForm AndAlso Me.GridGroupingControl1.TableDescriptor.FormEditMode <> TableEditMode.UseInlineTemplateForm Then
           Return
       End If

       If e.ButtonBarItem.ButtonBarItemType = ButtonBarItemType.Save Then
           Dim curRecord As Record = Me.GridGroupingControl1.FormEditCell.CurrentRecord

           Dim tb As TextBox = TryCast(Me.GridGroupingControl1.FormEditCell.FindControl("CustomerIDTB"), TextBox)
           ' If editing a current record, this will be disabled and the value will not be available.
           ' But this will be enabled when editing a new record, then lets go ahead and process it.
           If tb.Enabled Then
               curRecord.SetValue("CustomerID", tb.Text)
           End If

           tb = TryCast(Me.GridGroupingControl1.FormEditCell.FindControl("ContNameTB"), TextBox)
           curRecord.SetValue("ContactName", tb.Text)

           tb = TryCast(Me.GridGroupingControl1.FormEditCell.FindControl("CompNameTB"), TextBox)
           curRecord.SetValue("CompanyName", tb.Text)

           tb = TryCast(Me.GridGroupingControl1.FormEditCell.FindControl("CityTB"), TextBox)
           curRecord.SetValue("City", tb.Text)

           tb = TryCast(Me.GridGroupingControl1.FormEditCell.FindControl("CountryTB"), TextBox)
           curRecord.SetValue("Country", tb.Text)

           Me.GridGroupingControl1.Table.EndEdit()
           e.Handled = True
       End If

   End Sub