判断查询是否有数据


  SqlConnectionStringBuilder sb1 = new SqlConnectionStringBuilder();
            sb1.DataSource = "(local)";
            sb1.InitialCatalog = "lyy";
            sb1.IntegratedSecurity = true;
            sb1.PersistSecurityInfo = true;
            sb1.AsynchronousProcessing = true;
            sb1.MultipleActiveResultSets = true;
            conn1 = new SqlConnection(sb1.ConnectionString);
            conn1.Open();
            cmd1 = new SqlCommand();
            cmd1.Connection = conn1;
            cmd1.CommandText = "select name,pwd from [user] where name='" +this.textBox1.Text + "'";
            int count = cmd1.ExecuteNonQuery();
            if (count <= 0)
            {
                MessageBox.Show("用户名或密码错误！！", "提示窗口", MessageBoxButtons.OK, MessageBoxIcon.Information);
                i += 1;
                if (i >= 3)
                    button2.PerformClick();
                return;
            }
判断查询是否有数据，应该是怎么写的，我这个是哪里错了？