ServerValidateEventArgs Class
Provides data for the ServerValidate event of the CustomValidator control. This class cannot be inherited.
For a list of all members of this type, see ServerValidateEventArgs Members.
System.Object
System.EventArgs
System.Web.UI.WebControls.ServerValidateEventArgs
[Visual Basic] NotInheritable Public Class ServerValidateEventArgs Inherits EventArgs [C#] public sealed class ServerValidateEventArgs : EventArgs [C++] public __gc __sealed class ServerValidateEventArgs : public EventArgs [JScript] public class ServerValidateEventArgs extends EventArgs
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Remarks
A ServerValidateEventArgs is passed to the ServerValidate event handler to provide event data to the handler. The ServerValidate event is raised when validation is performed on the server. This allows you to perform a custom server-side validation routine on the value of an input control (with a CustomValidator control associated with it) in the event handler.
The value to validate is determined by using the Value property. Once your code has determined whether the value is valid, store the results of the validation in the IsValid property.
For a list of initial property values for an instance of ServerValidateEventArgs, see the ServerValidateEventArgs constructor.
For more information about handling events, see Consuming Events.
Example
[Visual Basic, C#] The following example demonstrates how to use a ServerValidateEventArgs to pass event data to a custom event handler for the ServerValidate event. Notice that the Value property of the ServerValidateEventArgs is used to determine the value to validate, while the IsValid property is used to store the results of the validation.
[Visual Basic] <%@ Page Language="VB" AutoEventWireup="True" %> <html> <head> <script runat="server"> Sub ValidateBtn_OnClick(sender As Object, e As EventArgs) ' Display whether the page passed validation. If Page.IsValid Then Message.Text = "Page is valid." Else Message.Text = "Page is not valid!" End If End Sub Sub ServerValidation(source As Object, args As ServerValidateEventArgs) Try ' Test whether the value entered into the text box is even. Dim num As Integer = Integer.Parse(args.Value) args.IsValid = ((num mod 2) = 0) Catch ex As Exception args.IsValid = false End Try End Sub </script> </head> <body> <form runat="server"> <h3>CustomValidator ServerValidate Example</h3> <asp:Label id="Message" Text="Enter an even number:" Font-Name="Verdana" Font-Size="10pt" runat="server" /> <p> <asp:TextBox id="Text1" runat="server" /> <asp:CustomValidator id="CustomValidator1" ControlToValidate="Text1" Display="Static" ErrorMessage="Not an even number!" ForeColor="green" Font-Name="verdana" Font-Size="10pt" OnServerValidate="ServerValidation" runat="server"/> <p> <asp:Button id="Button1" Text="Validate" OnClick="ValidateBtn_OnClick" runat="server"/> </form> </body> </html> [C#] <%@ Page Language="C#" AutoEventWireup="True" %> <html> <head> <script runat="server"> void ValidateBtn_OnClick(object sender, EventArgs e) { // Display whether the page passed validation. if (Page.IsValid) { Message.Text = "Page is valid."; } else { Message.Text = "Page is not valid!"; } } void ServerValidation(object source, ServerValidateEventArgs args) { try { // Test whether the value entered into the text box is even. int i = int.Parse(args.Value); args.IsValid = ((i%2) == 0); } catch(Exception ex) { args.IsValid = false; } } </script> </head> <body> <form runat="server"> <h3>CustomValidator ServerValidate Example</h3> <asp:Label id="Message" Text="Enter an even number:" Font-Name="Verdana" Font-Size="10pt" runat="server"/> <p> <asp:TextBox id="Text1" runat="server" /> <asp:CustomValidator id="CustomValidator1" ControlToValidate="Text1" Display="Static" ErrorMessage="Not an even number!" ForeColor="green" Font-Name="verdana" Font-Size="10pt" OnServerValidate="ServerValidation" runat="server"/> <p> <asp:Button id="Button1" Text="Validate" OnClick="ValidateBtn_OnClick" runat="server"/> </form> </body> </html> [Visual Basic] <%@ Page Language="VB" AutoEventWireup="True" %> <html> <head> <script runat="server"> Sub ValidateBtn_OnClick(sender As Object, e As EventArgs) ' Display whether the page passed validation. If Page.IsValid Then Message.Text = "Page is valid." Else Message.Text = "Page is not valid!" End If End Sub Sub ServerValidation(source As Object, args As ServerValidateEventArgs) Try ' Test whether the value entered into the text box is even. Dim num As Integer = Integer.Parse(args.Value) args.IsValid = ((num mod 2) = 0) Catch ex As Exception args.IsValid = false End Try End Sub Sub Page_Load(sende As object, e As EventArgs) ' Manually register the event-handling method for the ' ServerValidate event of the CustomValidator control. AddHandler CustomValidator1.ServerValidate, _ AddressOf ServerValidation End Sub </script> </head> <body> <form runat="server"> <h3>CustomValidator ServerValidate Example</h3> <asp:Label id="Message" Text="Enter an even number:" Font-Name="Verdana" Font-Size="10pt" runat="server" /> <p> <asp:TextBox id="Text1" runat="server" /> <asp:CustomValidator id="CustomValidator1" ControlToValidate="Text1" Display="Static" ErrorMessage="Not an even number!" ForeColor="green" Font-Name="verdana" Font-Size="10pt" runat="server"/> <p> <asp:Button id="Button1" Text="Validate" OnClick="ValidateBtn_OnClick" runat="server"/> </form> </body> </html> [C#] <%@ Page Language="C#" AutoEventWireup="True" %> <html> <head> <script runat="server"> void ValidateBtn_OnClick(object sender, EventArgs e) { // Display whether the page passed validation. if (Page.IsValid) { Message.Text = "Page is valid."; } else { Message.Text = "Page is not valid!"; } } void ServerValidation(object source, ServerValidateEventArgs args) { try { // Test whether the value entered into the text box is even. int i = int.Parse(args.Value); args.IsValid = ((i%2) == 0); } catch(Exception ex) { args.IsValid = false; } } void Page_Load(object sender, EventArgs e) { // Manually register the event-handling method for the // ServerValidate event of the CustomValidator control. CustomValidator1.ServerValidate += new ServerValidateEventHandler(this.ServerValidation); } </script> </head> <body> <form runat="server"> <h3>CustomValidator ServerValidate Example</h3> <asp:Label id="Message" Text="Enter an even number:" Font-Name="Verdana" Font-Size="10pt" runat="server"/> <p> <asp:TextBox id="Text1" runat="server" /> <asp:CustomValidator id="CustomValidator1" ControlToValidate="Text1" Display="Static" ErrorMessage="Not an even number!" ForeColor="green" Font-Name="verdana" Font-Size="10pt" runat="server"/> <p> <asp:Button id="Button1" Text="Validate" OnClick="ValidateBtn_OnClick" runat="server"/> </form> </body> </html>
[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button
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Requirements
Namespace: System.Web.UI.WebControls
Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family
Assembly: System.Web (in System.Web.dll)
See Also
ServerValidateEventArgs Members | System.Web.UI.WebControls Namespace | ServerValidateEventHandler | CustomValidator | ServerValidate