登录窗口认证后打开主窗体,但是主窗体总是自动最小化到任务栏了。怎么回事呀。下面是代码。SqlDataReader sda = datacon.getCom("select * from tb_User where UserName = '" + txt_UserName.Text.Trim() + "' and UserPassWord = '" + txt_UserPassWord.Text.Trim() + "'");
                sda.Read();
                if (sda.HasRows)
                {
                    this.Hide();
                    frm_Main frmMain = new frm_Main();
                    frmMain.Show();                    
                }