datalist中textbox取值有关问题，_ASP.NET

datalist中textbox取值问题，急
我在datalist中插入了一个TEXTBOX，怎么获取textbox所在的DATALIST主键值，下面代码如不带条件是可以全部更新数据库的，但不会加条件获取到对应TEXTBOX的主键值，求解答，急。。。

C# code

        protected void Button1_Click(object sender, EventArgs e)        {                               string sqlStr = "";             SqlConnection myConn = GetConnection();             myConn.Open();             for (int i = 0; i < DataList1.Items.Count - 1; i++)             {                                 TextBox tb = (TextBox)(DataList1.Items[i].FindControl("TextBox1"));                 sqlStr = "update gg_gg set gg_fknr= '" + tb.Text.Trim()+ "',gg_fkzt='1',gg_fksj='" + DateTime.Now.ToString() + "'where gg_id='[color=#FF0000]"+this.DataList1.DataKeys[i].ToString()+"[/color]'";             }             SqlCommand myCmd = new SqlCommand(sqlStr, myConn);             myCmd.ExecuteNonQuery();             myCmd.Dispose();             myConn.Close();             Response.Write("<script language=javascript>alert('信息反馈成功！');javascript:location.replace('ggfk.aspx')</script>");

------解决方案--------------------------------------------------------
首先你datalist的每一行里都有修改或删除按钮吧：你让按钮绑定主键值（我这里以imagebutton为例）

C# code

<asp:ImageButton class="DelClass" ID="IBDelClass" runat="server" CommandArgument='<%#Eval("Id")%>' CommandName="Del" ImageUrl="~/Images/Delete.gif"  ToolTip="删除该类..."/>//CommandArgument绑定每一样的主键后台取值：protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)        {            int id = Convert.ToInt32(e.CommandArgument.ToString());           //取到每行主键值后你修改或删除就都可以了        }
------解决方案--------------------------------------------------------
C# code  LZ你上面貌似是想做一个批量操作吧，代码貌似有点问题哦。简单的给你写一个吧，你拿改一下过去    1.页面序号列绑定你的主键,用Label显示  <asp:Label ID="Label1" runat="server" Text='<%# Eval("PK主键") %>'></asp:Label>  protected void Button1_Click(object sender, EventArgs e)        {                  string sqlStr = "";             SqlConnection myConn = GetConnection();             myConn.Open();             for (int i = 0; i < DataList1.Items.Count - 1; i++)             {                 Label Label1 = DataList1.Items[i].FindControl("Label1") as Label;                 string PKValue=Label1.Text; //获取每行的主键值                 TextBox tb = (TextBox)(DataList1.Items[i].FindControl("TextBox1"));                 string gg_fknr=tb.Text.Trim();  //获取文本框的值                    string gg_fksj=DateTime.Now.ToString();                 [color=#FF0000]此处分开写便于自己调试跟踪值[/color]                 sqlStr [color=#FF0000]+=[/color] "update gg_gg set                  gg_fknr= '"+gg_fknr+ "',gg_fkzt='1',gg_fksj='" + gg_fksj+ "'where                  gg_id='"+PKValue+'"[color=#FF0000];[/color]";             }             SqlCommand myCmd = new SqlCommand(sqlStr, myConn);             [color=#FF0000]备注如果是批量操作的话,建议LZ加上事务[/color]             int result= myCmd.ExecuteNonQuery();             if(result>0)             {                 Response.Write("<script language=javascript>alert('信息反馈成功！');javascript:location.replace('ggfk.aspx')</script>");             }             myCmd.Dispose();             myConn.Close();