how to add string to auto generated id in asp.net????

Question

In my Database I hve a col name as RequirementID like 1,2...but while retrieving the data from database into gridview I want to concatenate with string and Datetime and RequirementID number

                          for ex:I hve column data 1,2,3....etc but I want to  add like "QQ2014100001" can any one help me plz???