Question

this is the line of code where it shows the error

var physician = (from userAccounts in myDb.Physicians
                            where userAccounts.Phy_UserName == txtUserName.Text
                            select userAccounts).FirstOrDefault();

            setFirstName(physician.Phy_FName);

But in my setter I have a pre condition that if it’s a null value it wouldn’t do anything but how come it still shoes that error? here’s my setters code

public void setFirstName(string fName) {
            if (fName == null)
            {
            }
            else {
                firstName = fName;
            }
        }

Answer 1

Try this:

var physician = (from userAccounts in myDb.Physicians
                            where userAccounts.Phy_UserName == txtUserName.Text
                            select userAccounts).FirstOrDefault();

if(physician != null)
{
  setFirstName(physician.Phy_FName);
}
else
{
  //Throw Error or any any other processing as needed.
}