aspnet-devexpress-dot-web-dot-aspxgridview-665c146e.md
Enables you to prevent a row from being updated.
Namespace : DevExpress.Web
Assembly : DevExpress.Web.v25.2.dll
NuGet Package : DevExpress.Web
public event ASPxDataUpdatingEventHandler RowUpdating
Public Event RowUpdating As ASPxDataUpdatingEventHandler
The RowUpdating event's data class is ASPxDataUpdatingEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Cancel | Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs. |
| Keys | Gets a dictionary of field name/value pairs that represent the primary key of the row to update. |
| NewValues | Gets a dictionary that contains the values of the non-key field name/value pairs in the row to be updated. |
| OldValues | Gets a dictionary that contains the original field name/value pairs in the row to be updated. |
The RowUpdating event occurs when a user has changed cell values and tries to pass them to the data source by clicking the Update command. To cancel the update operation, set the Cancel argument property to true.
If you use edit form templates, you should process the update manually in the RowUpdating event handler.
After a row has been updated, the RowUpdated event is raised.
This example demonstrates how to use ASPxGridView to edit an in-memory data set with a master-detail relationship.
View Example: How to edit an in-memory data set with a master-detail relationship
To enable this behavior, follow the steps below:
Handle the RowUpdating, RowInserting, and RowDeleting events and update the data source manually.
Set the cancel argument property to true and call the grid’s CancelEdit() method.
<dx:ASPxGridView ID="MasterGridView" runat="server" AutoGenerateColumns="False" SettingsPager-PageSize="3"
KeyFieldName="ID" OnRowUpdating="MasterGridView_RowUpdating" Width="588px" OnRowDeleting="MasterGridView_RowDeleting" OnRowInserting="MasterGridView_RowInserting">
<!-- ... -->
<SettingsDetail ShowDetailRow="True" />
<Templates>
<DetailRow>
<dx:ASPxGridView ID="DetailGridView" runat="server" AutoGenerateColumns="False" SettingsPager-PageSize="4"
KeyFieldName="ID" OnBeforePerformDataSelect="DetailGridView_BeforePerformDataSelect"
OnRowUpdating="MasterGridView_RowUpdating" Width="100%">
<!-- ... -->
</dx:ASPxGridView>
</DetailRow>
</Templates>
</dx:ASPxGridView>
protected void MasterGridView_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e) {
ds = (DataSet)Session["DataSet"];
ASPxGridView gridView = (ASPxGridView)sender;
DataTable dataTable = gridView.GetMasterRowKeyValue() != null ? ds.Tables[1] : ds.Tables[0];
DataRow row = dataTable.Rows.Find(e.Keys[0]);
IDictionaryEnumerator enumerator = e.NewValues.GetEnumerator();
enumerator.Reset();
while (enumerator.MoveNext())
row[enumerator.Key.ToString()] = enumerator.Value;
gridView.CancelEdit();
e.Cancel = true;
}
Protected Sub MasterGridView_RowUpdating(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataUpdatingEventArgs)
ds = CType(Session("DataSet"), DataSet)
Dim gridView As ASPxGridView = CType(sender, ASPxGridView)
Dim dataTable As DataTable = If(gridView.GetMasterRowKeyValue() IsNot Nothing, ds.Tables(1), ds.Tables(0))
Dim row As DataRow = dataTable.Rows.Find(e.Keys(0))
Dim enumerator As IDictionaryEnumerator = e.NewValues.GetEnumerator()
enumerator.Reset()
While enumerator.MoveNext()
row(enumerator.Key.ToString()) = enumerator.Value
End While
gridView.CancelEdit()
e.Cancel = True
End Sub
View Example: Implement the Select All check box for a templated column in batch edit mode
View Example: How to use the Rich Text Editor to edit formatted text in the Edit Form
View Example: How to upload files and save them to a binary column in edit mode
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the RowUpdating event.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.
asp-net-web-forms-grid-create-master-detail-grid-at-runtime/CS/MasterDetailGrids/Default.aspx.cs#L38
masterGrid.Templates.DetailRow = new DetailGridTemplate();
masterGrid.RowUpdating += new DevExpress.Web.Data.ASPxDataUpdatingEventHandler(masterGrid_RowUpdating);
}
asp-net-web-forms-grid-create-master-detail-grid-at-runtime/VB/MasterDetailGrids/Default.aspx.vb#L40
masterGrid.Templates.DetailRow = New DetailGridTemplate()
AddHandler masterGrid.RowUpdating, AddressOf masterGrid_RowUpdating
End Sub
See Also