private void button1_Click(object sender, EventArgs e)
        {
            txt1 = textBox1.Text;
            txt2 = textBox2.Text;
            String connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Userinfo.accdb";
 
            OleDbConnection connection = new OleDbConnection(connectionString);
            OleDbDataAdapter adapter = new OleDbDataAdapter();
 
 
            OleDbCommand command = new OleDbCommand();
            // Create the InsertCommand.
 
            command.CommandType = CommandType.Text;
            command.CommandText = "INSERT INTO userinfo (Username, Pwd) VALUES (‘" + txt1 + "’ , ‘" + txt2 + "’)";
            command.Connection = connection;
            //command.Parameters.Add("txt1", OleDbType.Char, 5, "Username");
            //command.Parameters.Add("txt2", OleDbType.VarChar, 10, "Pwd");
 
            adapter.InsertCommand = command;
 
            connection.Open();
 
            command.ExecuteNonQuery();
            connection.Close();
}