Index was out of range. Must be non-negative and less than the size of the colle

写了一个GridVIew用单选按钮选择删除多行的功能
在自己电脑上都没有问题，但是一放到服务器上GridView在第二页之后删除一个或多个就会报错
错误提示如下:

Index was out of range. Must be non-negative and less than the size of the collection
Parameter name: index

哪位能帮我解决下，谢谢了。
代码如下
~.cs

private string GetSelIDlist()

        {

            string idlist = "";

            bool BxsChkd = false;

            for (int i = 0; i < gridView.Rows.Count; i++)

            {

                CheckBox ChkBxItem = (CheckBox)gridView.Rows[i].FindControl("DeleteThis");

                if (ChkBxItem != null && ChkBxItem.Checked)

                {

                    BxsChkd = true;

                    if (gridView.DataKeys[i].Value != null)//服务器上提示是在这一行错误

                    {

                        idlist += gridView.DataKeys[i].Value.ToString() + ",";

                    }

                }

            }

            if (BxsChkd)

            {

                idlist = idlist.Substring(0, idlist.LastIndexOf(","));

            }

            return idlist;

        }

--------------------编程问答-------------------- 相同问题，顶一个，求解释！ --------------------编程问答-------------------- 除 --------------------编程问答-------------------- gridView.DataKeys[i],i超出了datakeys的范围

补充：.NET技术 ,  ASP.NET