Disable ASP Button on Submit and capture the PostBack OnClick Event

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Introduction

This article describes how to disable an ASP button on click to prevent multiple clicks and still fire the button event on the server. This is a real simple solution that a colleague of mine Harpreet Chawla figured out.

The code

Just a real simple fix. Just add the event to the button attributes for the onclick event. It disables via client script the button, then returns the control to the Server button event through the GetPostBackEventReference method, which:

'Obtains a reference to a client-side script function that causes, when invoked, the server to post back to the page. This method also passes a parameter to the server control that performs the post-back processing on the server.' {MSDN Visual Studio Help}.

public class WebForm1 : System.Web.UI.Page
{
    protected System.Web.UI.WebControls.Button Button1;
    
    private void Page_Load(object sender, System.EventArgs e)
    {
    
    
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
        Button1.Attributes.Add("onclick","javascript:" + 
                  Button1.ClientID + ".disabled=true;" + 
                  this.GetPostBackEventReference(Button1));
        InitializeComponent();
        base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    { 
        this.Button1.Click += 
                new System.EventHandler(this.Button1_Click);
        this.Load += new System.EventHandler(this.Page_Load);
    }
    #endregion
    private void Button1_Click(object sender, System.EventArgs e)
    {
        System.Threading.Thread.Sleep(5000);
        //Response.Redirect("http://www.msn.com");
    }
}

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