How Sql Connection Apply With Class

HI,

I am going to make a big web application. so im going to use sql connection with class for example i have 100 web pages and i will make a slq connection in class.vb

Class1.vb(see the below code)

Imports System.Data

Imports System.Data.SqlClient

Imports Microsoft.VisualBasicPublic Class Class1

Private conn As New SqlConnection("Data Source=DANISHSQLEXPRESS;Initial Catalog=ARBASHHR.MDF;Integrated Security=True")Private cmd As New SqlCommand()

Private da As New SqlDataAdapter(cmd)

End Class

 default.aspx(here is asp.net page i want to use the sql connection from that class.)

but this below page saying that Name "cmd" is not declared and connection

Try

cmd.Connection = conn

conn.Open()Dim ds As New DataSet

cmd.CommandText = "SELECT * FROM Users where (UserName = N'" & TextBox1.Text & "')" 'And (Password = N '" & TextBox2.Text & "')"da.Fill(ds, "data")

conn.Close()

 For Each dt As DataTable In ds.Tables

For Each dr As DataRow In dt.RowsTextBox3.Text = dr.Item("Password")

Next drNext dt

If TextBox2.Text = TextBox3.Text ThenResponse.Redirect("Welcome.aspx")

Else

Label3.Text = "Invalid Username/password"

End IfCatch ex As Exception

' MsgBox(ex.Message) '("Error Loading Information From Database..", MsgBoxStyle.Critical, "Error")

End Try

End Sub

please let me know where im doing mistake.....

Thank in Advance