How To Restore .bak File in sql Database Using c#???

Question

hi friends...

 

                     i have a .bak file of sql server database. and now i want to restore that database in the sqlserver database using c#.net.

 

                     i am using the below query

                   string query = "RESTORE DATABASE'"+cmd_database_list.Text.Trim()+"' FROM DISK = '" + txt_back_file.Text.Trim() + "'"; 

 

                     an error occured that 

                  Cannot open backup device 'E:\Print_Label13-08-2014.bak'. Operating system error 2(The system cannot find the file specified.).    

                     RESTORE DATABASE is terminating abnormally.

 

                i am not geting that what to do now????

                Please help me out...

Thanks...