Problem in connecting SQL 2005 to Visual Studio 2008

Hello,

I'm creating a system that can save the employee record, I named it table EMPLOYEE. I have installed visual studio 2008 and sql server 2005 in my computer. This is the sample code with the connection string:
try
{
SqlConnection connect = new SqlConnection();

connect.ConnectionString = @"server = PC-NAME/SQLEXPRESS;data source = localhost; initial catalog = myDatabasename; integrated security = SSPI";
connect.Open();
SqlCommand cmd = new SqlCommand("INSERT INTO EMPLOYEE(EMP_NO,EMP_LAST,EMP_FIRST,EMP_POS,EMP_OFC,EMP_DIV,EMP_GEN)" + "VALUES('" + emp_num.Text + "'" + "," + "'" + emp_last_name.Text + "'" + "," + "'" + emp_first_name.Text + "'" + "," + "'" + emp_pos.Text + "'" + "," + "'" + emp_ofc.Text + "'" + "," + "'" + emp_div.Text + "'" + "," + "'" + emp_gen.Text + "'" + ")", connect);
//SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd, connect);
cmd.ExecuteNonQuery();
connect.Close();
MessageBox.Show("Record has been saved.");
}
catch (Exception ex)
{
MessageBox.Show(ex.GetBaseException().ToString(), "Connection Status");

}

I also tried some tips from the internet, like:
- made the SQL Server Browser service Automatic.
- enabled the Protocols for SQLEXPRESS TCP/IP.

Still, I cannot connect to database.
The connection status states:

System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.

Can someone help me? Thanks.