How I drag and drop mail message to text box as input in C#

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C#

Outlook

hello,
How can I drag and drop mail message to text box as input in c# , so after that I can save it in a other path.
I try all the solution I found in internet and it did not work.
I want to be able to drag and drop file from explorer (it work now) or mail item,
or mail attachments ( it work)

What I have tried:

public class MyTextBox : TextBox
{
public Outlook.Application _Outlook = new Outlook.Application();
public MyTextBox()
{
AllowDrop = true;
Multiline = true;
DragDrop += new DragEventHandler(MyTextBox_DragDrop);
DragEnter += new DragEventHandler(MyTextBox_DragEnter);

}
...
..
..
private void MyTextBox_DragEnter(object sender, DragEventArgs e)
{
// for this program, we allow a file to be dropped from Explorer
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{ e.Effect = DragDropEffects.Copy; }
// or this tells us if it is an Outlook attachment drop
else if (e.Data.GetDataPresent("FileGroupDescriptor"))
{ e.Effect = DragDropEffects.Copy; }
// or none of the above
else

{ e.Effect = DragDropEffects.None;

}
// e.Effect = DragDropEffects.Copy;
}
..
..
private void MyTextBox_DragDrop(object sender, DragEventArgs e)
{

{
if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)
{
this.Text = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];
}
else if (e.Data.GetDataPresent("FileGroupDescriptor"))
{

Stream theStream = (Stream)e.Data.GetData("FileGroupDescriptor");
byte[] fileGroupDescriptor = new byte[512];
theStream.Read(fileGroupDescriptor, 0, 512);
// used to build the filename from the FileGroupDescriptor block
StringBuilder fileName = new StringBuilder("");
// this trick gets the filename of the passed attached file
for (int i = 76; fileGroupDescriptor[i] != 0; i++)
{ fileName.Append(Convert.ToChar(fileGroupDescriptor[i])); }
theStream.Close();
string path = Path.GetTempPath();
// put the zip file into the temp directory
string theFile = path + fileName.ToString();
this.Text = theFile;
if (theFile.Contains(".msg"))
{

Outlook.Explorer oExplorer = _Outlook.ActiveExplorer();
Outlook.Selection oSelection = oExplorer.Selection;
Outlook.MailItem mi = (Outlook.MailItem)oSelection;
mi.SaveAs(Path.GetTempPath() + mi.Subject.ToString() + ".msg",Outlook.OlSaveAsType.olMSG);
theFile = Path.GetTempPath() + mi.Subject.ToString() + ".msg";

this.Text = theFile;
FileInfo tempFile = new FileInfo(theFile);
if (!tempFile.Exists == true)
{
MessageBox.Show("File was not created!" + Environment.NewLine + theFile);
}
}
else
{

MemoryStream ms = (MemoryStream)e.Data.GetData(
"FileContents", true);

byte[] fileBytes = new byte[ms.Length];

ms.Position = 0;
ms.Read(fileBytes, 0, (int)ms.Length);

FileStream fs = new FileStream(theFile, FileMode.Create);
fs.Write(fileBytes, 0, (int)fileBytes.Length);

fs.Close(); // close the file

FileInfo tempFile = new FileInfo(theFile);

// always good to make sure we actually created the file
if (!tempFile.Exists == true)
{
MessageBox.Show("File was not created!" + Environment.NewLine + theFile);
}
}
}