中国高铁有多快:vb.net下进行WEB编程，如何连SQL2000数据库！

如题，在vb.net下进行WEB编程，如何连SQL2000数据库！
我按书上连，一直跟我报找不到“data sourse”关键词！
im sqlcon As New SqlConnection
sqlcon.ConnectionString = "Data Sourse=DDFSTT;database=Usertable;User id=sa;pwd="
Dim sqlcmd As New SqlCommand
sqlcmd.Connection = sqlcon
sqlcmd.CommandText = "select Username from Usertable='" + Me.Usertextbox.Text.Trim() + "'"
Dim name As String = String.Empty
Try
sqlcon.Open()
name = CType(sqlcmd.ExecuteScalar(), String).Trim()
Catch ex As Exception
Me.Lbshow.Text = ex.Message
Finally
sqlcon.Close()
End Try
If Not name = String.Empty Then
Response.Redirect("Usermain.aspx")
Else
Me.Lbshow.Text = "用户名不正确！"
End If