C#, Operator '??' cannot be applied to operands of type 'decimal' and 'decimal'

Question

public decimal v1 {
  get {
    return this._v1; 
  }
  set {
    this._v1 = value ?? 0M;  // also I tried, default(decimal)
  }
}

Error message say :

Operator '??' cannot be applied to operands of type 'decimal' and 'decimal'

Why it does not work, and how should I do make it works?

Answer 1

The decimal type cannot be null, so the null-coalesce operator makes no sense here. Just set _v1 to value.