c# 问题?

Form1.cs代码::namespace xueshen
{
public partial class Form1 : Form

{
public static string usernames;
public static string passwords;
sql sqlcline = new sql();
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
SqlDataReader sqlread = sqlcline .read ("select username, passowrd from user where username='"+textBox1.Text.Trim()+"' and password='"+textBox2.Text.Trim()+"'");
sqlread.Read ();
if (sqlread.HasRows)
{
usernames = textBox1.Text.Trim();
passwords = textBox2.Text.Trim();
Form2 form2 = new Form2();
this.Hide();
form2.Show();

}
else
{
//MessageBox.Show("错误信息&

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