Using multiple dropdownlist in gridview control

Can u tell me how to write the selectedIndexChanged event for these dropdownlists. I have set the OnselectedIndexChanged="drplocation_selected"

protected void drplocation_selected(object sender,EventsArgs e)

{

Here how to access the dropdownlist since they are in empty data template?

}

You can access it in the following way

DropDownList drplocation = (sender as DropDownList);

I did not get it is that line enough?

You need to place that line in the SelectedIndexChanged event that you created. You asked how to get the dropdownlist, so that line I gave will give you the DropDownList that is causing the event

protected void drplocation_selected(object sender,EventArgs e)
    {
        DropDownList ddl = (DropDownList)sender;
        string locationid = ddl.SelectedValue.ToString();
    }
In this event i need to populate drpstore based on the location selected. 

In the above event
How do i access the other dropdownlist which is in the next column of the same row?