how to handle null value while getting image in asp.net

Question

Session[EmpPhoto] = dsUser.Tables[0].Rows[0][EmpPhoto].ToString(); imageUser.ImageUrl = Session[Photo].ToString();//here i am getting error i have to show username and userphoto after he logged into the site. but for a particular user i dont have image so i am getting error Object reference not set to an instance of an object.

sowjanya bommithi · Answer

Hi Nitin yes you are right i was modified that thing . now i am getting the image while debugging but it not display in image control but alternate image is diplaying. i was saved the img in db as varbinary(MAX)

Nitin Sontakke · Answer

Could it be a problem that on first line you are saying Session[EmpPhoto] and on second line you are saying Session[Photo] ? Remember that Session is just dictionary which is not even type safe. It means if you ask for a value which is not been set it will simply return null.

Rajeev Punhani · Answer

Hi Sowjanya Please check for null or empty session before casting it. if (! string .IsNullOrEmpty(Session[ Photo ] as string )) { imageUser.ImageUrl = Session[ Photo ].ToString(); } else { imageUser.ImageUrl = default image url ; //Set default image here }