未将对象引用设置到对象的实例。

???什么东东？那一行》

public partial class Sys_BranchDetail : TowinCore.BasePage
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            if(!IsPostBack)
            {
               if(this.Request["option"]!=null)
               {
                   if (this.Request["option"] == "add")
                   {

                   }
                   else
                   {
                       this.BindBranchInfo();
                   }
               }
            }
        }


        private void BindBranchInfo()
        {
            string strsql = "select tb_branchId, tb_branchName,effective  from  t_Branch  where  tb_branchId= '" + this.Request["cCode"].ToString() + "'";
            DataTable dt = Db.GetDataTable(strsql);
            this.TBX_Branchcode.Text = dt.Rows[0]["tb_branchId"].ToString();
            this.TBX_Branchname.Text=dt.Rows[0]["tb_branchName"].ToString();
            this.DDL_effective.SelectedValue = dt.Rows[0]["effective"].ToString();
        }

        protected void Btn_Save_Click(object sender, EventArgs e)   //保存部门信息
        {
            if (this.TBX_Branchname.Text == "")
            {
                Response.Write("<script language=javascript>alert('您还没有填写部门名称!')</script>");
            }
            else

            {
                string str = "";
                if (this.Request["option"].ToString() == "add")
                {
                    str = "insert into t_Branch(tb_branchId,tb_branchName,effective) values('" +TBX_Branchcode.Text+ "','" + this.TBX_Branchname.Text + "','" + this.DDL_effective.SelectedValue+ "')";
                }
                else
                {
                    str = "update t_Branch  set tb_branchName='" + this.TBX_Branchname.Text + "' where  tb_branchId='"+this.Request["cCode"].ToString()+"'";
                }
               TowinCore.Db.ExecuteSQL(str);
                Cls_Message.ShowPageMessage("操作成功！", this.Page);
            }


        }

        protected void Btn_Cancel_Click(object sender, EventArgs e)
        {
            //取消操作
            this.TBX_Branchcode.Text = "";
            this.TBX_Branchname.Text = "";
            Response.Write("<script>if(confirm(\"确定取消操作？\")==true){window.close();}</script>");
        }
    }

调试一下，看下
this.Request["option"]是否有值