Hello Vijay,

Thank you for contacting us!

The first approach that you mentioned should be enough to fulfill the desired requirement, but as I understand you want to invoke the enable/disable on checkbox click. Keep in mind that this is a dynamic change that should be handled appropriately by the application Lifecycle. For example, the right time to set Grids behaviors is on Page_Init or Load.

With that said, another approach could be to invoke a postback on checkbox click, and disable the behavior on Page_Load/Init. The only tricky part would be to determine the postback control id, but this is achievable with the following method:

private string getPostBackControlName()
{
	Control control = null;
	//first we will check the "__EVENTTARGET" because if post back made by       the controls
	//which used "_doPostBack" function also available in Request.Form collection.
	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 they having an additional "quasi-property" in their Id which identifies
			//mouse x and y coordinates
			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 == null) ? "" : control.ID;

}

And now on Page_Init you can use the following check:

string id = getPostBackControlName();

if (!String.IsNullOrEmpty(id) && (id == "Button1"))
{
 // Disable sorting behavior
}