制作简单的投票页面

我想做一个简单的投票页面，我有一个应该工作的代码，但似乎。cs文件不想识别gridview

public partial class _Default : System.Web.UI.Page 
{
    int Count = 0;
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnVote_Click(object sender, EventArgs e)
    {
        if (radVote.SelectedItem != null)
        {
            InsertVotes(radVote.SelectedItem.ToString());
        }
        else
        {
            lblStatus.ForeColor = Color.Red;
            lblStatus.Text = "Please select at least one option to vote for poll";
        }
    }
    protected void InsertVotes(string theVote)
    {
        try
        {
            XmlDocument xmldoc = new XmlDocument();
            xmldoc.Load(Server.MapPath("Votes.xml"));
            XmlElement parentelement = xmldoc.CreateElement("Vote");
            XmlElement votechoice = xmldoc.CreateElement("Choice");
            votechoice.InnerText = theVote;
            parentelement.AppendChild(votechoice);
            xmldoc.DocumentElement.AppendChild(parentelement);
            xmldoc.Save(Server.MapPath("Votes.xml"));
            lblStatus.ForeColor = Color.Green;
            lblStatus.Text = "Thank you for your vote.";
        }
        catch
        {
            lblStatus.Text = "Sorry, unable to process request. Please try again.";
        }
    }
protected void readXML()
{
    int mCount = 0;
    int iCount = 0;
    int gCount = 0;
    XmlTextReader xmlreader = new XmlTextReader(Server.MapPath("Votes.xml"));
    DataSet ds = new DataSet();
    ds.ReadXml(xmlreader);
    xmlreader.Close();
    if (ds.Tables.Count > 0)
    {
        int dscount = ds.Tables[0].Rows.Count;
        for (int i = 0; i < dscount; i++)
        {
            if (ds.Tables[0].Rows[i][0].ToString() == "Mozilla")
                mCount++;
            else if (ds.Tables[0].Rows[i][0].ToString() == "Internet Explorer")
                iCount++;
            else if (ds.Tables[0].Rows[i][0].ToString() == "Google Chrome")
                gCount++;
        }
        double theTotal;
        theTotal = mCount + iCount + gCount;
        double mPercent;
        double oPercent;
        double gPercent;
        mPercent = (mCount / theTotal) * 100;
        oPercent = (iCount / theTotal) * 100;
        gPercent = (gCount / theTotal) * 100;
        double totalpercentage = mPercent + oPercent + gPercent;
        string[] votescount = { mCount.ToString(), iCount.ToString(), gCount.ToString() };
        string[] array = { mPercent.ToString(), oPercent.ToString(), gPercent.ToString() };
        DataTable dt = new DataTable();
        dt.Columns.Add("OPTION_NAME");
        dt.Columns.Add("VOTES");
        dt.Columns.Add("PERCENTAGE");
        int count = radVote.Items.Count;
        Count = count + 1;
        for (int i = 0; i < count; i++)
        {
            dt.Rows.Add();
            dt.Rows[i]["OPTION_NAME"] = radVote.Items[i].ToString();
            dt.Rows[i]["VOTES"] = votescount[i];
            dt.Rows[i]["PERCENTAGE"] = array[i];
        }
            dt.Rows.Add("Total", theTotal, totalpercentage);
            gvResult.DataSource = dt;
            gvResult.DataBind();
   }
   else
   {
        gvResult.DataSource = null;
        gvResult.DataBind();
   }
}
protected void butResults_Click(object sender, EventArgs e)
{
    readXML();
}
int cnt = 0;
protected void gvResult_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    cnt++;
    Label lblpercent = (Label)e.Row.FindControl("lblpercentage");
    HtmlTable tblpercent = (HtmlTable)e.Row.FindControl("tblBar");
    tblpercent.Width = lblpercent.Text+"%";
    if (lblpercent.Text == "0")
    {
        tblpercent.Visible = false;
    }
    if (cnt == Count)
    {
        e.Row.CssClass = "TablePollResultFoot";
    }
    foreach (TableCell tc in e.Row.Cells)
    {
        tc.Attributes["style"] = "border-color:#CCCCCC";
    }
}
protected void btnResult_Click(object sender, EventArgs e)
{
    readXML();
}

}

gvResult, radVote, lblStatus都有一个错误，说该名称在当前上下文中不存在。我已经检查了名称，一切似乎都很好，但我仍然得到这个错误。

在html中，我有radiobuttonlist, gridview，一个投票按钮和一个显示结果的按钮