gridview字段限定在特定字符数内

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script>  ///  <summary>
        /// 截取字符串函数
         ///  </summary>
        ///  <param name="str">所要截取的字符串 </param>
        ///  <param name="num">截取字符串的长度 </param>
        ///  <returns> </returns>
        static public string GetSubString(string str, int num)
        {
            #region
            return (str.Length > num) ? str.Substring(0, num) + "......" : str;
            #endregion
        } 
protected void GridView1_DataBound(object sender, EventArgs e)
    {
        for (int i = 0; i  <= GridView1.Rows.Count - 1; i++)
        {
            if (GridView1.Rows[i].Cells[2].Text.Length > 10)//Cells[2]是你要限定字符的列数
            {
                GridView1.Rows[i].Cells[2].Text = GridView1.Rows[i].Cells[2].Text.Substring(0, 10) + "...";
            }
        }
    }