How Can I Connect To Sqlserver Express Manually When I Use Text Boxed

hi guys,


i am very happy that i found this forum which discuss ASP.net.
i am new to ASP.net 2.0 and some need serious help. when i debug my application and try to insert data an error occur saying:

"Cannot open database "ecb" requested by the login. The login failed. Login failed for user 'HOME-USERuser'."

the code that i have used to submit data is as follow:

Imports System.Data.SqlClient
...
  Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click

      Dim objConn As SqlConnection
      Dim objCmd As SqlCommand



objconn = New SqlConnection("data source= localhostsqlexpress; initial catalog =ecb; persist security info =true; trusted_connection=true")

objCmd = New SqlCommand("INSERT INTO staff (firstname, surname) VALUES (@firstname, @surname,)", objConn)

objCmd.Parameters.Add("@FirstName", Data.SqlDbType.VarChar).Value = txtFirstName.Text
objCmd.Parameters.Add("@Surname", Data.SqlDbType.VarChar).Value = txtSurname.Text

objConn.Open()
objCmd.ExecuteNonQuery()
objConn.Close()


i also used this data connection but didn't help:
objconn = New SqlConnection("Server=localhost; Database=ecb;user ID='  ';Password='  ' ") when i use this data

connection i get this message: Login failed for user ''. The user is not associated with a trusted SQL Server connection.

as far as i can remember i have used windows authentication when creating my database in sql server 200 express edition.

the funny thing is that when i use datagrid wizard or dataform the connection is fine ( i mean is automatically done for me but i don't know when i like to do it manually does not work).

can anyone help? thank you in advanced