CommandEventArgs.CommandName Property
.NET Framework (current version)
Gets the name of the command.
Assembly: System.Web (in System.Web.dll)
Use the CommandName property to determine the command to perform. The CommandName property can contain any string set by the programmer. The programmer can then identify the command name in code and perform the appropriate tasks.
The following example demonstrates how to use the CommandName property to programmatically determine the command to perform.
<%@ Page Language="VB" AutoEventWireup="True" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Button CommandName Example</title> <script runat="server"> Sub CommandBtn_Click(sender As Object, e As CommandEventArgs) Select e.CommandName Case "Sort" ' Call the method to sort the list. Sort_List(CType(e.CommandArgument, String)) Case "Submit" ' Display a message for the Submit button being clicked. Message.Text = "You clicked the Submit button" ' Test whether the command argument is an empty string (""). If CType(e.CommandArgument , String) = "" Then ' End the message. Message.Text &= "." Else ' Display an error message for the command argument. Message.Text &= ", however the command argument is not recogized." End If Case Else ' The command name is not recognized. Display an error message. Message.Text = "Command name not recogized." End Select End Sub Sub Sort_List(commandArgument As String) Select commandArgument Case "Ascending" ' Insert code to sort the list in ascending order here. Message.Text = "You clicked the Sort Ascending button." Case "Descending" ' Insert code to sort the list in descending order here. Message.Text = "You clicked the Sort Descending button." Case Else ' The command argument is not recognized. Display an error message. Message.Text = "Command argument not recogized." End Select End Sub </script> </head> <body> <form id="form1" runat="server"> <h3>Button CommandName Example</h3> Click on one of the command buttons. <br /><br /> <asp:Button id="Button1" Text="Sort Ascending" CommandName="Sort" CommandArgument="Ascending" OnCommand="CommandBtn_Click" runat="server"/> <asp:Button id="Button2" Text="Sort Descending" CommandName="Sort" CommandArgument="Descending" OnCommand="CommandBtn_Click" runat="server"/> <br /><br /> <asp:Button id="Button3" Text="Submit" CommandName="Submit" OnCommand="CommandBtn_Click" runat="server"/> <asp:Button id="Button4" Text="Unknown Command Name" CommandName="UnknownName" CommandArgument="UnknownArgument" OnCommand="CommandBtn_Click" runat="server"/> <asp:Button id="Button5" Text="Submit Unknown Command Argument" CommandName="Submit" CommandArgument="UnknownArgument" OnCommand="CommandBtn_Click" runat="server"/> <br /><br /> <asp:Label id="Message" runat="server"/> </form> </body> </html>
.NET Framework
Available since 1.1
Available since 1.1
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