Instead of an Open File Dialog sending a list of files as a string.. I want to replace it with my own.

OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Multiselect = true;
if (EhrAmendmentCur != null)
{
openFileDialog.Multiselect = false;
}
if (openFileDialog.ShowDialog() != DialogResult.OK)
{
return;
}
string[] fileNames = openFileDialog.FileNames;
if (fileNames.Length < 1)
{
return;
}