using System;
using System.Data;
using System.Data.SqlClient;
string sConnectionString = "Integrated Security=SSPI;Initial Catalog=;Data Source=localhost;";
SqlConnection objConn = new SqlConnection(sConnectionString);
objConn.Open();
string sSQL = "INSERT INTO Users (uname,upwd) VALUES ('" + textbox1.Text + "','" + textbox2.Text + "')";
SqlCommand objCmd = new SqlCommand(sSQL,objConn);
objCmd.ExecuteNonQuery();