Prompt user with an output file dialog at program startup (initialize)

Question

I am currently working with output files. I am in the process of building a program that request for the user to save an output file before the program does anything else. The purpose is that the program will write results to this output file. I have been able to get the output file dialog to appear with a button click. Is there away to prompt the user with output file dialog as soon as the program initializes?

Code-output file through button:

namespace open_document
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Filter = "Text Files | *.txt";
            openFile.ShowDialog();          
            StreamReader infile = File.OpenText(openFile.FileName);

        }

    }
}

Answer 1

Why don't you use the Load event of the Form or Page, as per your requirement:

Designer:

this.Load += new System.EventHandler(this.MainForm_Load);

Code:

private void MainForm_Load(object sender, EventArgs e)
{   
    OpenFileDialog openFile = new OpenFileDialog();
    openFile.Filter = "Text Files | *.txt";
    openFile.ShowDialog();          
    StreamReader infile = File.OpenText(openFile.FileName);
    // ... 
}