How to string Replace in asp.net C#

Question

 

 

Table Designing:

 

 TempId      TempName      Message

      1               Fees                   Dear * your * is pending amount

 

Front end selected value in "*"  D

 

How to this text in "*" only get it different value  replace the data.

 

I want This result :

 Dear  John your 25000 is started pending amount