Change font color for a GridView column

Hi there!
 
My GridView is into Repeater.
 
So after its binding I'm trying to change font color of the 2nd column.
 

       protected void Page_Load(object sender, EventArgs e)
        {
            GridView gv = (GridView)Page.FindControl("GridView1");
            gv.Columns[1].ControlStyle.ForeColor = System.Drawing.Color.Red;
        }

But got an error.
 
What event should I use?
 

Thank you!