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        {
            con.Open();
            String sqltext = "select * from emp where empno=@empno";
            SqlCommand cmd = new SqlCommand(sqltext, con);
            cmd.Parameters.AddWithValue("@empno", this.TextBox.Text);
           
            GridView1.DataSource = cmd.ExecuteReader();
            GridView1.DataBind();
        }
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San Diego
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