private void btnLogIn_Click(object sender, EventArgs e)
    {
        //ekserastikh2016_1_6.Properties.Settings.Database1ConnectionString
        SqlConnection customConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["ekserastikh2016_1_6.Properties.Settings.Database1ConnectionString"].ConnectionString);
        customConnection.Open();
        string checkUsername = "select count(*) from [Table] where Username='" + textBox1.Text + "'";
        SqlCommand com = new SqlCommand(checkUsername, customConnection);
        int a = Convert.ToInt32(com.ExecuteScalar().ToString());
        customConnection.Close();
        if (a == 1)
        {
            customConnection.Open();
            string checkPassword = "select Password from [Table] where Username='" + textBox2.Text + "'";
            SqlCommand p = new SqlCommand(checkPassword, customConnection);
            string pass = p.ExecuteScalar().ToString();
            if (pass == textBox2.Text)
                { MessageBox.Show("hello"); }
            else
                { MessageBox.Show("Wrong Username or password"); }
        }
        else
        {
            MessageBox.Show("Wrong Username or password From (If (a==1)else)");
        }


    }