VB.net高手请进，一个简单登录页代码错误

登录页和代码页分别是login.aspx和login.aspx.vb代码页的验证代码： Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click GridView1.DataBind() If GridView1.Rows.Count <> 0 Then Dim gvr As GridViewRow = GridView1.Rows(0) Dim name As String = GridView1.Rows(0).Cells(2).Text Response.Write(name) Session.Add("name", name) Response.Redirect("newsmag.aspx") End If其中，GridView1这个控件绑定了数据库中的用户名和密码。现在的问题是：当在登录页输入正缺的用户名后，它老提示如下错误：异常详细信息: System.FormatException: 输入字符串的格式不正确。源错误: 行 4: 行 5: Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click行 6: GridView1.DataBind()行 7: If GridView1.Rows.Count <> 0 Then行 8: Dim gvr As GridViewRow = GridView1.Rows(0)源文件: F:尀服务器尀news1111111111尀login.aspx.vb 行: 6 请高手给看看吧，实在找不到原因啊。。。一楼的大侠您好：由于这里发不了，具体的堆栈跟踪信息见：http://blog.sina.com.cn/s/blog_4a0a22660100lnna.html