[C#] Builder and stub

Builder :

string filepath = string.Empty;

    SaveFileDialog saveDlg = new SaveFileDialog();

    {

    saveDlg.FileName = "Server.exe";

    saveDlg.Filter = "Executable Files (*.exe)|*.exe";



    if (saveDlg.ShowDialog() == DialogResult.OK)

    filepath = saveDlg.FileName;

    else

    return;

    }

    File.Copy(Application.StartupPath+@"\stub.exe", filepath);



    string split = "-whatever-";

    string info = split + txtWhatever.text +

    split;



    FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.ReadWrite, FileShare.None);

    {    

    BinaryWriter bw = new BinaryWriter(fs);

    fs.Position = fs.Length + 1;

    bw.Write(info);

    bw.Close();

    }

Stub : (Split string if more needed)

StreamReader sr = new StreamReader(System.Windows.Forms.Application.ExecutablePath);

    BinaryReader br = new BinaryReader(sr.BaseStream);



    byte[] fileData = br.ReadBytes(Convert.ToInt32(sr.BaseStream.Length));

    br.Close();

    sr.Close();



    ASCIIEncoding Conv = new ASCIIEncoding();



    string whatever = Conv.GetString(fileData).Substring(Conv.GetString(fileData).IndexOf("-whatever-")).Replace("-whatever-", "");