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Posted 2 Apr 2011

Finding out which control caused the Postback

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


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.


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 
            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); 
                    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.


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


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Comments and Discussions

SuggestionNot fully correct Pin
Navik9-Aug-13 3:22
memberNavik9-Aug-13 3:22 
GeneralMy vote of 3 Pin
Arlen Navasartian4-Apr-11 6:16
memberArlen Navasartian4-Apr-11 6:16 
GeneralMy vote of 1 Pin
Selvin3-Apr-11 0:46
memberSelvin3-Apr-11 0:46 
GeneralMy vote of 5 Pin
Ahmad Hyari2-Apr-11 23:44
memberAhmad Hyari2-Apr-11 23:44 
QuestionWhy is this an article? Pin
Pete O'Hanlon2-Apr-11 23:03
mvpPete O'Hanlon2-Apr-11 23:03 

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