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Finding out which control caused the Postback

, 2 Apr 2011
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This code is very useful for those who want to know which aspcontrol has caused the postback.

Introduction

There will be many instances where we would want to skip the (!IsPostBack), for which we have to know which control has triggered the postback, hence this code snippet.

Background

Add Global.asax to the project (right click project, add new item, add global).

Using the Code

The method GetPostBackControl should be written in Global.asax file (so that it is accessible globally across the application).

public class Global : System.Web.HttpApplication 
{ 
    public static System.Web.UI.Control GetPostBackControl(System.Web.UI.Page page) 
    { 
        Control control = null; string ctrlname = page.Request.Params["__EVENTTARGET"]; 
        if (ctrlname != null && ctrlname != String.Empty) 
        { 
            control = page.FindControl(ctrlname); 
        } // if __EVENTTARGET is null, the control is a button type and we need to 
          // iterate over the form collection to find it 
        else 
        { 
            string ctrlStr = String.Empty; 
            Control c = null; 
            foreach (string ctl in page.Request.Form) 
            { // handle ImageButton controls ... 
                if (ctl.EndsWith(".x") || ctl.EndsWith(".y")) 
                { 
                    ctrlStr = ctl.Substring(0, ctl.Length - 2); 
                    c = page.FindControl(ctrlStr); 
                } 
                else 
                { 
                    c = page.FindControl(ctl); 
                } 
                if (c is System.Web.UI.WebControls.Button || 
			c is System.Web.UI.WebControls.ImageButton) 
                { 
                    control = c; break; 
                } 
             } 
        } 
        return control; 
    } 
} 
This is very useful for tough web applications.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

sekharkaza

United States United States
No Biography provided

Comments and Discussions

 
SuggestionNot fully correct PinmemberNavik9-Aug-13 2:22 
GeneralMy vote of 3 PinmemberArlen Navasartian4-Apr-11 5:16 
GeneralMy vote of 1 PinmemberSelvin2-Apr-11 23:46 
GeneralMy vote of 5 PinmemberAhmad Hyari2-Apr-11 22:44 
QuestionWhy is this an article? PinmvpPete O'Hanlon2-Apr-11 22:03 

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