C #登录代码

  
    

   
     try
   
     
{
 
   
     string
   
      NameStr
   
     =
   
     this
   
     .txtName.Text;
 
   
     string
   
      AgeStr 
   
     =
   
     this
   
     .txtAge.Text;
 SqlConnection conn 
   
     =
   
      
   
     new
   
      SqlConnection(
   
     "
   
     Data Source=hetao;Initial Catalog=TestDB;Integrated Security=True
   
     "
   
     );
 conn.Open();
 SqlCommand cmd
   
     =
   
     new
   
      SqlCommand(
   
     "
   
     select count(*) as flag from T_UserName where name=
   
     "
   
     +
   
     "
   
     '
   
     "
   
     +
   
     NameStr
   
     +
   
     "
   
     '
   
     "
   
     +
   
     "
   
     and age =
   
     "
   
     +
   
     "
   
     '
   
     "
   
     +
   
      AgeStr
   
     +
   
     "
   
     '
   
     "
   
     ,conn);
 cmd.ExecuteNonQuery();
 
   
     int
   
      flag
   
     =
   
     Convert.ToInt32(cmd.ExecuteScalar().ToString());
 
 
   
     if
   
     (flag
   
     >
   
     0
   
     )
 {
 frmMain fm 
   
     =
   
      
   
     new
   
      frmMain();
 fm.Show();
 
   
     this
   
     .Hide();
 }
 
   
     else
   
     
 {
 
   
     this
   
     .labelX3.Enabled
   
     =
   
     true
   
     ;
 
   
     this
   
     .labelX3.Text
   
     =
   
     "
   
     出错
   
     "
   
     ;
 
   
     this
   
     .labelX3.Visible
   
     =
   
     true
   
     ; 
 }


 
}

   
     catch
   
     
{
 MessageBox.Show(
   
     "
   
     用户名和密码错误
   
     "
   
     );
}