Problem with characters in c#

I think there may be 2 issues.
 
1. The font of the control in which the text is being is displayed, may not be capable of showing the letters specific to the that type. So, try setting the Font of the Control to the one, which can handle those characters.
2. There may be an issue with the CurrentCulture. So, try setting the CurrentCulture to the culture appropriate culture for the above characters, like

Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo 
("hi-IN");

The list of Culture Codes are given here
Culture Names [C#][^]
 
and here
http://msdn.microsoft.com/en-us/goglobal/bb896001[^]
 
The advantage of setting the CurrentCulture to the appropriate culture specific to the above characters, is that, it will ensure proper sorting.