数据库查询Database中的表

public class UserDA
{

SqlConnection conn;
SqlCommand cmd;
public UserDA(Use uuu)
{
conn =new SqlConnection( "server=" + uuu.Server + ";database=" + uuu.Database + ";user=" + uuu.User + ";pwd=" + uuu.Pwd);
cmd = conn.CreateCommand();
}

public ArrayList Table(string database)
{
cmd.CommandText = "Select TABLE_NAME FROM "+database+".INFORMATION_SCHEMA.TABLES Where TABLE_TYPE='BASE TABLE' ";
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
string a = null;
if (dr.HasRows)
{
while(dr.Read())
{
a = dr["TABLE_NAME"].ToString();
al.Add(a);
}
}
cmd.Dispose();
conn.Close();
return al;
}

public partial class Form2 : Form
{
private Use UUU;
public Form2(Use uuu)
{
InitializeComponent();
UUU = uuu;
}

private void Form2_Load(object sender, EventArgs e)
{
ArrayList aaa = new UserDA(UUU).Table(UUU.Database);
for (int y = 0; y < aaa.Count; y++)
{
comboBox1.Items.Add(aaa[y]);
}
}