Raise validation in DataGrid-------CausesValidation in DataGrid

DataGrid CausesValidation in Datagrid


As we edit the DataGrid, we may want to validate the data entered by the user to ensure the correctness and completeness of the data. There are many different ways to solve this problem, such as: we can use the validation controls in Vs.net, such as: RequiredFieldValidator. So we need the Update button in the DataGrid to raise validation to verify that the data entered by the user is empty. The Update button contains a CausesValidation property.

Public Property CausesValidation () as Boolean

Members belong to: System.Web.UI.WebControls.LinkButton



Summary:

Gets or sets a value that indicates whether validation is performed when the System.Web.UI.WebControls.LinkButton control is clicked.






We can use this property to derive validation by controlling whether a WebControl is raised.

DataGrid ItemDataBound Event:

If (E.item.itemtype = listitemtype.edititem) Then

Setupdatecommandcausesvalidation (E.item, True)

End If

Private Function setupdatecommandcausesvalidation (ByVal item as DataGridItem, ByVal Valor as Boolean) as String

If (item. Hascontrols ()) Then

For each celula as control in item. Controls

For each Possiblebutton as control in Celula. Controls

If (Possiblebutton.gettype (). Name.equals ("Datagridlinkbutton")) Then

Dim LBT as LinkButton = CType (Possiblebutton, LinkButton)

If (LBT. Text.equals (Getupdatecolumntext ()) Then

Lbt. CausesValidation = Valor

Exit for

End If

End If

Next

Next

End If

End Function

Private Function Getupdatecolumntext () as String

Dim text as String = ""

For each coluna as DataGridColumn in Datagrid1.columns

If (Coluna. GetType (). Name.equals ("EditCommandColumn")) Then

Dim Colunaedit as EditCommandColumn = CType (Coluna, EditCommandColumn)

Text = Colunaedit.updatetext

Exit for

End If

Next

return text

End Function