C# login page using ADO.Net

Firstly create table in the database by name login 

C# code :-

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.SqlClient;   namespace WindowsFormsApplication16 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         SqlDataAdapter da;         DataSet ds;             private void Form1_Load(object sender, EventArgs e)         {             }         private void button1_Click(object sender, EventArgs e)         {             da = new SqlDataAdapter("select * from login", "data source=MKS-PC\\SQLEXPRESS;Initial Catalog=master;integrated security=true");             ds = new DataSet();             da.Fill(ds);             foreach (DataRow dr in ds.Tables[0].Rows)             {                 if (dr[0].ToString().Trim() == textBox1.Text && dr[1].ToString().Trim() == textBox2.Text)                 {                     Form2 f = new Form2();                     f.Show();                       break;                   }                   else                 {                     MessageBox.Show("Invalid");                 }               }         }     } }

Output :