Database Creation & permission

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C#3.0

C#

private void OpenToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Title = "database selection ";
            dlg.Filter = "database file (*.mdf)|*.mdf";
            dlg.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            if (dlg.ShowDialog() == DialogResult.OK)
            {

 label1.Text = dlg.FileName;// Error here :: you don't have permission to open this file.


            }
        }

I create an appliction that create database programmatically, and I used a Dialog (OpenFileDialog class) in it;
for user to select the database which I mentioned above.
now when user want to open it(the *.mdf file that created ), it says <<you don't have permission to open this file.>>
my code for database creation is :

CREATE DATABASE TestDb  
 ON PRIMARY 
 (NAME = TestDb_Data,  FILENAME = 'C:\TestDb_Data.mdf',  SIZE = 2MB,FILEGROWTH =10%) 
 LOG ON
 (NAME =TestDb_Log,  FILENAME = 'C:\TestDb_Log.ldf',  SIZE = 1MB, FILEGROWTH =10%)

How should I change the code to get permission to the user ? or what I must better do ?gimme Solution...