public void tableBind() 
{
     //动态添加数据（只取了一小部分代码）
     for (i = 0; i < ds.Tables[0].Rows.Count;i++ )
     {
         txtbox.ID = "tb" + i.ToString();
         txtbox.Attributes.Add("OnBlur", "javascript:ChangeText();");//加一个焦点获得事件
     }
}//
public int imarkbind() 
    {
        int imark = 0;
        foreach (System.Web.UI.Control con in this.Page.FindControl("divform").Controls)       
       {
            if (con is System.Web.UI.WebControls.TextBox)
            {
                if ((((TextBox)con).Text.Trim())!="")
                {
                     imark = imark + Convert.ToInt32(((TextBox)con).Text.Trim());//求和
                } 
            }
        }
        return imark;
    }

function ChangeText() {
            document.getElementById("tbTransportPoint").value = <%=imarkbind() %>;//tbTransportPoint为和显示的textbox
         }