初学提问 按照书本敲 也显示了异常

初学提问 按照书本敲 也显示了错误
编译错误 
说明: 在编译向该请求提供服务所需资源的过程中出现错误。请检查下列特定错误详细信息并适当地修改源代码。 

编译器错误信息: CS1518: 应输入 class、delegate、enum、interface 或 struct

源错误:

 

行 17: }
行 18: }
行 19: protected void btnValidate_Click(Object sender,EventArgs e)
行 20: {
行 21: int i=userNameValidate();
 

源文件: e:\My Documents\Visual Studio 2005\WebSites\WebSite1\Register.aspx.cs 行: 19 

C# code

using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class Default2 : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {    }}protected void btnValidate_Click(Object sender,EventArgs e){int i=userNameValidate();}///<summary>///验证用户是否存在///</summary>public int userNameValidate(){sqlConnection conn=new sqlConnextion(ConfigurationManager.Appsettings["DBConnectionString"]);SqlCommand selecCmd =new SqlCommand("select * from Users where  userId='"+txtName.Text.Trim()+"'",conn);int i=0;try{conn.open();SqlDataReader sdr = SelectCmd.ExecuteReader();if (sdr.Read()){int i=1;lblMessage.Text="此用户已存在，请输入其他用户名";}else{lblMessage.Text="此用户名是可用的！";}}catch(System.exception ee){Response.write("<script language=javascript>alert('"+ee.Message.toString+"')</script>");}finally{conn.Close;}}

[解决办法]
把第18行的大括号移到最后面
[解决办法]
sqlConnection conn=new sqlConnextion(ConfigurationManager.Appsettings["DBConnectionString"]);
写错字母了 是 sqlConnection 不是 sqlConnextion
最后还少一个括弧
[解决办法]
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
}去掉
protected void btnValidate_Click(Object sender,EventArgs e)
{
int i=userNameValidate();
}
///<summary>
///验证用户是否存在
///</summary>
public int userNameValidate()
{
SqlConnection conn=new SqlConnection(ConfigurationManager.Appsettings["DBConnectionString"]);
SqlCommand selecCmd =new SqlCommand("select * from Users where userId='"+txtName.Text.Trim()+"'",conn);
int i=0;
try{
conn.open();
SqlDataReader sdr = SelectCmd.ExecuteReader();
if (sdr.Read())
{
int i=1;
lblMessage.Text="此用户已存在，请输入其他用户名";
}
else{
lblMessage.Text="此用户名是可用的！";
}
}
catch(System.exception ee){
Response.write("<script language=javascript>alert('"+ee.Message.toString+"')</script>");

}
finally{
conn.Close;
}
}
}增加
[解决办法]
public int userNameValidate() 
明显得函数体没有返回值么。。。

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