[求助]用户代码未处理 System.Data.SqlClient.SqlException
刚学.NET，在看北大青鸟的教程，按照教程的内容写了一段代码，但是运行的时候提示出错。请求解答，我用的是VS2005


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;
using System.Data.SqlClient;

public partial class login : System.Web.UI.Page

{
protected void Page_Load(object sender, EventArgs e)
{

string userName = Request.Form[ "userName "].ToString();
string userPwd = Request.Form.Get( "userPwd ").ToString();

SqlConnection con=new SqlConnection( "server=.;database=login;uid=sa;pwd=; ");
con.Open();
SqlCommand cmd=new SqlCommand( "select count(*) form login where userName= ' "+userName+ " ' and userPwd= ' "+userPwd+ " ' ", con);
int count=Convert.ToInt32(cmd.ExecuteScalar());
if(count> 0)
{
Response.Redirect( "main.aspx ");
}
else
{
Response.Redirect( "loginfail.html ");
}

}
}

错误提示就在这一行上：int count=Convert.ToInt32(cmd.ExecuteScalar());


详细的错误信息：


Message= "第 1 行: 'login ' 附近有语法错误。 "
Source= ".Net SqlClient Data Provider "
ErrorCode=-2146232060
Class=15
LineNumber=1
Number=170
Procedure= " "
Server= ". "
State=1
StackTrace:
在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
在 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)

在 System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
在 System.Data.SqlClient.SqlDataReader.get_MetaData()
在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
在 System.Data.SqlClient.SqlCommand.ExecuteScalar()
在 login.Page_Load(Object sender, EventArgs e) 位置 f:\NetPrc\Prc01\login.aspx.cs:行号 25
在 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
在 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
在 System.Web.UI.Control.OnLoad(EventArgs e)
在 System.Web.UI.Control.LoadRecursive()
在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


[解决办法]
SqlCommand cmd=new SqlCommand( "select count(*) form login where userName= ' "+userName+ " ' and userPwd= ' "+userPwd+ " ' ", con);
==========================================================
SqlCommand cmd=new SqlCommand( "select count(*) from login where userName= ' "+userName+ " ' and userPwd= ' "+userPwd+ " ' ", con);

是from 不是 form