Payment gateway callback action method executing multiple

Dear All,

 

Currently am working in mvc 5 ,working for payment gateway, after payment confirmation callback action method executing multiple times.

 

Currently am taking tha data from  

HttpContext.Request.Form; 

 

 Once this was executed it should validate the function and rediarect to view .

 

but the same action method was executing multiple times .

 

 

can some one help me 

 

am using asp.net mvc c#

 

 

Thanks