c# Filedialog problems

Question

I have a question about the opfiledialog function within c#. When i dont select a file with openfiledialog it put's a text automaticly in my textbox. That text will be "filedialog1". What can i do to fix this.

using System;
using System.Windows.Forms;
using System.IO;

namespace Flashloader
{
    public partial class NewApplication : Form
    {

        private toepassinginifile _toepassinginifile;
        private controllerinifile _controllerinifile;



        //private controllerinifile _controlIniFile;

        public NewApplication(toepassinginifile iniFile)
        {
            _controllerinifile = new controllerinifile();
            _toepassinginifile = iniFile;

            InitializeComponent();
            controllerComboBox.DataSource = _controllerinifile.Controllers;
        }

        public bool Run()
        {
            var result = ShowDialog();
            return result == System.Windows.Forms.DialogResult.OK;            
        }

        private void button4_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "Srec Files (.a20; .a21; .a26; .a44)|*.a20; *.a21; *.a26; *.a44|All files (*.*)|*.*";

            openFileDialog1.Title = ("Choose a file");
            openFileDialog1.InitialDirectory = Path.Combine(Directory.GetCurrentDirectory());
            openFileDialog1.RestoreDirectory = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                fileBox.Text = (System.IO.Path.GetFileName(openFileDialog1.FileName));
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Toepassing toepassing = new Toepassing();

            toepassing.Name = nameBox.Text;
            toepassing.Controller = (Flashloader.Controller)controllerComboBox.SelectedItem;
            toepassing.TabTip = descBox.Text;
            toepassing.Lastfile = openFileDialog1.FileName;
            fileBox.Text = openFileDialog1.FileName;

            if (nameBox.Text == "")
                MessageBox.Show("You haven't assigned a Name");
            else if (controllerComboBox.Text == "")
                MessageBox.Show("You haven't assigned a Controller");
            else if (descBox.Text == "")
                MessageBox.Show("You haven't assigned a Desciption");
            else if (fileBox.Text == "")
                MessageBox.Show("You haven't assigned a Applicationfile");
            _toepassinginifile.ToePassingen.Add(toepassing);
            _toepassinginifile.Save(toepassing);

            MessageBox.Show("Save Succesfull");

            DialogResult = DialogResult.OK;
            this.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            var newcontroller = new Newcontroller(_controllerinifile);
            newcontroller.ShowDialog();
            controllerComboBox.DataSource = null;
            controllerComboBox.DataSource = _controllerinifile.Controllers;

        }
    }
}

Thanks all for the help

Answer 1

When you use the Form Designer to add an OpenFileDialog control on you form, the designer assigns at the property FileName the value openFileDialog1.
I suppose you have set something as the initial value for the property FileName. Then in button_click3 you have no mean to check for the DialogResult and thus you get inconditionally this default back.

Fix it removing this default from the designer FileName property