How to display a messagebox indicate wrong file format in drag-n-drop class?

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Hi..i use drag and drop class to undergo process of data whenever a text file is drag into the form..But how to display a messagebox indicate wrong file format whenever file other than text file is drag into the form?Below are some codes of my program,did i wrong somewhere and where should i add?thanks.

C#

private void Form1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
        {
            string file= "";
            if(e.Data.GetDataPresent(DataFormats.Text))
            {
                file = (string)e.Data.GetData(DataFormats.Text);
            }
            else if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] fileNames;
                fileNames = (string[])e.Data.GetData(DataFormats.FileDrop);
                file = fileNames[0];
            }

Posted 29-Jul-12 21:27pm

Esmond90

Updated 29-Jul-12 22:35pm

v3

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Christian Graus · Answer 1 · 2012-07-29T21:30:00

Solution 1

C#

MessageBox.Show("wrong file format");

If a file is being dragged on, surely you can check the file extension and see if it's .txt ?

Posted 29-Jul-12 21:30pm

Christian Graus

Comments

Esmond90 30-Jul-12 3:38am

Thanks for reply..I mean how to let the programme know wrong format is dragged on?

Christian Graus 30-Jul-12 3:44am

your drag argument must give you the file path, otherwise how could you open the file ? Or does it give a file stream ? If you have a file stream, try to read it and let the user know if you fail. Otherwise, do what I said before.

Esmond90 30-Jul-12 4:33am

I have updated my question,is there any wrong and where should i add the Messagebox indicates the wrong format?