Question

I am getting this

Nullable object must have a value.

error in this line:

   results.Test= installment.Test1.Value;

My ‘Test’ property looks like this:

 [DataMember]
 public int Test{ get; set; }

And my ‘Test1’ property looks like this in LINQ2SQL Designer:

public System.Nullable<int> Test1
    {
        get
        {
            return this._Test1;
        }
        set
        {
            if ((this._test1!= value))
            {
                this.OnTest1Changing(value);
                this.SendPropertyChanging();
                this._Test1= value;
                this.SendPropertyChanged("Test1");
                this.OnTest1Changed();
            }
        }
    }

What am I doing wrong here?

Answer 1

Your Test1 property is (still) null. The underlying field _Test1 will default to null.
You can use

results.Test = installment.Test1 ?? 0;

if 0 is an acceptable default value.