Structure containing the temporary overriding stack policy body. If you pass StackPolicyDuringUpdateBody and
            StackPolicyDuringUpdateURL, only StackPolicyDuringUpdateBody is used. If you want to update protected resources, specify a
            temporary overriding stack policy during this update. If you do not specify a stack policy, the current policy that associated with the
            stack will be used.
             
            
Constraints:
 Declaration Syntax
 Declaration Syntax| C# | 
public string StackPolicyDuringUpdateBody { get; set; }