各位大侠 帮我看看 问题怎样解决 ？感激不尽啊——来自一个大学才开始碰电脑学电脑的学生！

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
      
    }
    public enum SearchType
    {
        NotSet=-1,
        Products=0,
        Category=1
    }
    protected void radioButton_CheckdChanged(object sender, EventArgs e)
    {
        if (RadioButton1.Checked)
        {
            MultiView1.ActiveViewIndex = (int)SearchType.Products;
        }
        else if(RadioButton2.Checked)
        {
            MultiView1.ActiveViewIndex = (int)SearchType.Category;
        }
    }
    protected void buttonSearch_Click(object sender, EventArgs e)
    {
        if (MultiView1.ActiveViewIndex > -1)
        {
            string searchTerm = "";
            SearchType mSerchType = (SearchType)MultiView1.ActiveViewIndex;
            switch (mSearchType)
            {
                case SearchType .Products:
                    DoSearch(TextBox1.Text,mSearchType);
                    break;
                case SearchType.Category:
                    DoSearch(TextBox2.Text, mSearchType);
                case SearchType.NotSet:
                    break;
            }
        }
    }
    protected void DoSearch(object sender, EventArgs e)
    {
        string results = "你在查询{0}for{1}.";
        Label1.Text = string.Format(results,searchTerm);
    }

}
/*错误    1    当前上下文中不存在名称“mSearchType”    E:\Documents\Visual Studio 2008\WebSites\WebSite2\Default2.aspx.cs    43    21    E:\...\WebSite2\
错误    2    当前上下文中不存在名称“mSearchType”    E:\Documents\Visual Studio 2008\WebSites\WebSite2\Default2.aspx.cs    46    44    E:\...\WebSite2\
错误    3    当前上下文中不存在名称“mSearchType”    E:\Documents\Visual Studio 2008\WebSites\WebSite2\Default2.aspx.cs    49    45    E:\...\WebSite2\
错误    4    当前上下文中不存在名称“searchTerm”    E:\Documents\Visual Studio 2008\WebSites\WebSite2\Default2.aspx.cs    58    45    E:\...\WebSite2\
*/