Display Private Characters in DataGrid or List???

I think you’re talking about Unicode "private use characters" (in Private Use Areas (PUA)).

They are not designed to be displayed using regular fonts, so you need your own custom font. Do you already have one? In not, you can use Microsoft application "Private Character Editor" (PCE), supplied with Windows: eudcedit.exe. You need to use this font in your application in a regular way.

Using PCE, you can link you Private Use Characters to some or all fonts in your font library on the system. When this is done, you can use any regular font (if it is linked to you Private font created with PCE) in any System.Windows.Forms control or WPF FrameworkElement. Importantly, you can mix Private Use Characters with regular characters in one string.

ListView lv = new ListView();
//...
lv.Items.Add(new ListViewItem(
    "Normal characters; Private use character: " +
     Convert.ToChar(0xE000)));

...or whatever like that.