Question

My application needs to save a JPEG image file with a file name provided in a TextBox. I don’t want to use SaveFileDialog because I don’t want the user to see the dialog or be able to change the location of the saved image.

How can I set the name of the saved file from a TextBox?

private void button1_Click(object sender, EventArgs e)
{
    if (textBox4.Text.Length >= 1)
       bitmap.Save(@"C:\Test.jpg");
}

Answer 1

What about:

if(filename.IndexOfAny(Path.GetInvalidFileNameChars()) != -1)
   bitmap.Save(textBox4.Text);
else
   MessageBox.Show("Error: the file name contains invalid chars");

EDIT:

That doesn’t work. Because it must save the file to C: and the file
must be a jpg image, just like my code. I know how to solve this with
SaveFileDialog, but i don’t want to see any dialog saving the file and
the users must not change where i want to save it.

if(filename.IndexOfAny(Path.GetInvalidFileNameChars()) != -1)
   bitmap.Save(@"C:\" + textBox4.Text + ".jpg");
else
   MessageBox.Show("Error: the file name contains invalid chars");