use the below code
System.Convert.ToBase64String(ASCIIEncoding.UTF8.GetBytes("
0x00D25D1B005BBC4E86FD45C7C3DDCC3701000000ED7007675C13943EC40EDF3E0BD14055110EBFE82A69C38F53DC908223CA472D"))
Result:
MHgwMEQyNUQxQjAwNUJCQzRFODZGRDQ1QzdDM0REQ0MzNzAxMDAwMDAwRUQ3M<br />
DA3Njc1QzEzOTQzRUM0MEVERjNFMEJEMTQwNTUxMTBFQkZFODJBNjlDMzhGNTNEQzkwODIyM0NBNDcyRA==