当前文件： AjaxCheckUser/App_Code/CheckUser.cs[1K，2009-6-12 11:31:35]，打开代码结构图

		            
 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Web;
 5using System.Web.Security;
 6using System.Web.UI;
 7using System.Web.UI.WebControls;
 8using System.Web.UI.WebControls.WebParts;
 9using System.Web.UI.HtmlControls;
10using System.Data.SqlClient;
11//该源码下载自www.51aspx.com(５１ａｓpｘ．ｃｏｍ)
12
13/**//// <summary>
14/// CheckUser 的摘要说明
15/// </summary>
16public class CheckUser
17...{
18    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbuser"].ConnectionString);
19
20    public CheckUser()
21    ...{
22        //
23        // TODO: 在此处添加构造函数逻辑
24        //
25    }
26
27    public bool CheckUsers(String name)
28    ...{
29        String T_name = name;
30
31        String sql = "select * from info where UserName='" + T_name + "'";
32
33        SqlCommand cmd = new SqlCommand(sql, con);
34
35        try
36        ...{
37            con.Open();
38
39            SqlDataReader MyReader = cmd.ExecuteReader();
40
41            if (MyReader.Read())
42            ...{
43                return true;
44            }
45            else
46            ...{
47                return false;
48            }
49        }
50        catch (Exception ex)
51        ...{
52            throw (ex);
53        }
54        finally
55        ...{
56            con.Close();
57        }
58    }
59}
60