c# database program does not work in other computer

i have given the code i used to connect to the database....
i want my installation of the program to create a database for itself...i searched alot for the soln but i can't figure it out...the installion file of my program doesn't create the database and the connection string in the app.config file is still same as in my computer...i think it should change with the change in computer because the datasource changes with the computer..
please help me with this
thanks for your concern





using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace trydb.dll
{
class dllsqlhelper
{
public string getconstr()
{
string constr = System.Configuration.ConfigurationManager.ConnectionStrings["trydb"].ToString();
return constr;
}
public int insertUserInfo(string user, string pass)
{
// string res;
int i=0;
SqlConnection con = new SqlConnection();
con.ConnectionString = getconstr();
string sql = "insert into tbluser([username],[password]) values('" + user + "','" + pass + "')";
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
try
{
i = cmd.ExecuteNonQuery();
// res="sucess";
}
catch (Exception ex)
{
// res= "failure";
throw;

}
finally
{
con.Close();

}
return i;
}
}
}

how can we create a new database using c#... the connectionstring requires the data source name