Error while trying insert values into a database table. Help!

I keep getting an error that says Incorrect syntax near ','. When I try to insert values into a database table. Here's the code:

===================================================================

using System;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Text;


public class MemberFileReader
{
private MemberFileReader()
{
}


public static void ParsePositional(string FileName)
{

String strSQLInsert = "INSERT INTO Members VALUES(" +
tempCType+ "," +tempNRDS+ "," +tempLastName+ "," +
tempFirstName+ "," +tempMiddleName+ "," +tempStatus+ "," +
tempEmail+ ")";


System.Data.SqlClient.SqlConnection connStr =
new System.Data.SqlClient.SqlConnection();


connStr.ConnectionString = "data source=WALTERPPK\SQLEXPRESS;Integrated Security=True;AttachDBFilename=C:\\Documents and Settings\\ugo\\My Documents\\Visual Studio 2005\\Projects\\DataExchange_3\\DataExchange_3\\stlCR_temp.mdf;user instance=true";


System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = strSQLInsert;
cmd.Connection = connStr;

connStr.Open();

cmd.ExecuteNonQuery();

connStr.Close();

}

}

==============================================================

Any ideas
Thx