网格视图超出范围异常，值在范围内

我有一个GridView:

<asp:GridView runat="server" ID="_gv_AllResp" Width="100%"  style="color: White;" DataKeyNames="recordid" 
    Font-Size="10pt" OnDataBound="_gvDataBind_Eve"  AutoGenerateSelectButton="true" OnSelectedIndexChanged="_gv_AllResp_SelectedIndexChanged">
      <RowStyle HorizontalAlign="Center" />
      <HeaderStyle BackColor="#57768f"/>
      <RowStyle BackColor="#dae2e8" ForeColor="Black" />
      <AlternatingRowStyle BackColor="#ffffff" ForeColor="Black" />
</asp:GridView>

我从ADO后面的代码绑定:

SELECT a.[recordid], [lname] + ', ' + [fname] as [name], Convert(char, [datebirth],   101)  as 'DOB', phone1, phone2, phone3, ext FROM [dbo].[Respondent] a

然后，我有一个过程从网格中选择随机数量的记录，并将它们插入到表中:

var rnd = new Random();
        var _rand = Enumerable.Range(0, _RowCount).Select(x => new { val = x, order =  rnd.Next() }).OrderBy(i => i.order).Select(x => x.val).Take(_LockCount).ToArray();
        string _jobnum = _dd_ActJobs.SelectedValue.ToString();
        foreach (var a in _rand)
        {
            int b = Convert.ToInt32(a);
            using (var con = new SqlConnection())
            {
                con.ConnectionString = ConfigurationManager.ConnectionStrings["RM_V1.0CS"].ConnectionString;
                try
                {
                    con.Open();
                    var cmd = new SqlCommand("INS_DemoLockQuery", con) { CommandType = CommandType.StoredProcedure };
                    cmd.Parameters.Add("@jobnum", SqlDbType.NVarChar, 100, "jobnum");
                    cmd.Parameters.Add("@respnum", SqlDbType.NVarChar, 100, "respnum");
                    cmd.Parameters.Add("@name", SqlDbType.NVarChar, 100, "name");
                    cmd.Parameters.Add("@phone", SqlDbType.NVarChar, 100, "phone");
                    cmd.Parameters.Add("@wphone", SqlDbType.NVarChar, 100, "wphone");
                    cmd.Parameters.Add("@wphone_ext", SqlDbType.NVarChar, 100, "wphone_ext");
                    cmd.Parameters.Add("@cellphone", SqlDbType.NVarChar, 100, "cellphone");
                    cmd.Parameters.Add("@quota", SqlDbType.NVarChar, 100, "quota");
                    cmd.Parameters["@jobnum"].Value = _jobnum;
                    //GETTING ERROR HERE 
                    cmd.Parameters["@respnum"].Value = _gv_AllResp.Rows[b].Cells[1].Text.ToString();
                    cmd.Parameters["@name"].Value = _gv_AllResp.Rows[b].Cells[2].Text.ToString();
                    cmd.Parameters["@phone"].Value = _gv_AllResp.Rows[b].Cells[4].Text.ToString().Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@wphone"].Value = _gv_AllResp.Rows[b].Cells[5].Text.ToString().Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@wphone_ext"].Value = _gv_AllResp.Rows[b].Cells[6].Text.ToString().Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@cellphone"].Value = _gv_AllResp.Rows[b].Cells[7].Text.ToString().Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@quota"].Value = _ddActQuota.SelectedValue.ToString();
                    cmd.ExecuteNonQuery();
                    ViewAvailable();
                }
                //catch (Exception ex) { ErrHandler.WriteError(ex.Message); }
                finally { con.Close(); }
            }
        }

我得到下面的"索引超出范围。"必须非负且小于集合的大小。例如，对于这个特定的测试，网格中有145行，b的值(行号)是120。这在允许的行范围内。我不明白为什么这超出了索引范围。

堆栈跟踪

   at System.Collections.ArrayList.get_Item(Int32 index)
   at System.Web.UI.WebControls.GridViewRowCollection.get_Item(Int32 index)
   at Default3._b_selectRepond(Object sender, EventArgs e) in   c:'Afocus'Jobs'Query.aspx.cs:line 668
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at     System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(Str     ing eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean  includeStagesAfterAsyncPoint)

有什么建议吗?提前感谢男生/女生

EDIT @ James

我只是尝试使用您建议的datakeynames，并将插入块替换为

                    cmd.Parameters["@jobnum"].Value = _jobnum;
                    cmd.Parameters["@respnum"].Value = _gv_AllResp.DataKeys[b]["recordid"].ToString();
                    cmd.Parameters["@name"].Value = _gv_AllResp.DataKeys[b]["Name"].ToString().Replace(" ", "");
                    cmd.Parameters["@phone"].Value = _gv_AllResp.DataKeys[b]["Main"].ToString().Replace(" ", "").Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@wphone"].Value = _gv_AllResp.DataKeys[b]["Work Phone"].ToString().Replace(" ", "").Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@wphone_ext"].Value = _gv_AllResp.DataKeys[b]["ext"].ToString().Replace(" ", "").Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@cellphone"].Value = _gv_AllResp.DataKeys[b]["Cell Phone"].ToString().Replace(" ", "").Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Trim();
                    cmd.Parameters["@quota"].Value = _ddActQuota.SelectedValue;

然而，我仍然得到同样的错误，我试图"锁定"50条记录，在网格中有145行，它循环了23次，然后在135行(b=135)抛出了一个错误。必须非负且小于集合的大小。参数名称:index"