So I am making a program using winforms, and when I save my text file I want it to auto increment. Example saves as file_01.txt, file_02.txt, file_03.txt

I can't seem to get it to work...

Here's my code

        private void Button1_Click(object sender,EventArgs e)
    {
        using (SaveFileDialog saveFileDialog = new SaveFileDialog())
        { 
            string filePath = "C\\";
            int fileCount = 0;
            String fileName = "File_0"   $"{fileCount}";
            bool checkFileName = true;
            while (checkFileName)
            {
                fileName = "File_0"   $"{fileCount}.txt";
                fileCount  ;

                string checkName = filePath   "\\"   fileName;
                checkFileName = File.Exists(checkName);
            }

            saveFileDialog.FileName = fileName;
            saveFileDialog.Title = "Save Files";
            saveFileDialog.InitialDirectory = $"{filePath}";
            saveFileDialog.CheckPathExists = true;
            saveFileDialog.DefaultExt = "txt";
            saveFileDialog.Filter = "Text files |*.txt";
            saveFileDialog.RestoreDirectory = true;

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                using (StreamWriter sw = new StreamWriter(saveFileDialog.OpenFile()))
                {
                    foreach (string item in regoListBox.Items)
                    {
                        sw.WriteLine(item);

                    }
                }
            }
        }
    }

CodePudding user response：

The reason it does not work is because you are not specifying filePath correctly. Therefore it fails to check for incremental filenames.

Change it to this:

//string filePath = "C\\";
string filePath = "C:\\";