ASP.NET: How to retrieve an argument manually wired up with GetPostBackClientHyperlink

Scenario:

You have wired up a link/button on the page with Page.ClientScript.GetPostBackClientHyperlink, passed it an argument and you need to retrieve that argument whenever the event is fired for the said link/button.

Solution:

In the event in question, you will want to put a check in to make sure that the __EVENTTARGET is the UniqueID of control in question and then you will want to pull out the __EVENTARGUMENT value form the request. Here are examples in VB.Net and C#:

VB.Net

Dim arg As String = ""

If Request.Params("__EVENTTARGET") = linkDeleteGoal.UniqueID Then
    arg = Request.Params("__EVENTARGUMENT")
End If

C#

string arg = "";

if (Request.Params("__EVENTTARGET") == linkDeleteGoal.UniqueID)
{
    arg = Request.Params("__EVENTARGUMENT");
}