problem in giving color to gridview cell

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ASP.NET

hi,
In a gridview i am trying to give color to a cell depending on its value from database.below i the code. but it give green color to all. which is else part.whats wrong.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{    
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if ((string.IsNullOrEmpty(e.Row.Cells[3].Text) != true) 
                  || (e.Row.Cells[3].Text != " "))
            {
                string result = (e.Row.Cells[3].Text);
                if (result == "not working")
                    e.Row.Cells[3].BackColor= System.Drawing.Color.DarkRed;
                else
                    e.Row.Cells[3].BackColor= System.Drawing.Color.DarkOliveGreen;
             }
         }    
}