Open your own Chat Provider

 

Find method below. I think you set nickName=loginName; in the below method. so the display name will same as the loginname.

 

public override bool GetUserInfo(string loginName, ref string nickName, ref bool isAdmin)
  {
  }

 

You can change the section to the name you want to show, like

 

nickName="jagpalbashati";

 

all user will display as jagpalbashati.

 

Regards,

 

Ken