Discussion: the buttons in webcontrol have both onclientclick and onclick events to verify the control effectiveness.

Recently, when performing form verification, the form contains three Textbox, one of which is a verification control that is not empty for verification in webcotrol, and the other two use JS verification, the last is a webcotrol button. We all know that it has an onclientclick event and an onclick event. Therefore, onclientclick verifies the server event executed by the client and the onclick event, but there is a problem, if both of them are usedCodeBut webcontrol verifies the effectiveness of the control. I don't know what's going on! If you know or do not know anything, please share the following comments and discuss them here!
The Code executed by onclientclick is as follows:

Function Checkform ()
{
If(Document. getelementbyid ("Txtname"). Value="" ){
Alert ("Not null" );
Return False ;
}
Return True ;
}