Version Used: Visual Studio Community 15.6.1

Steps to Reproduce:
Here is the example code.

class Class1
{
    private volatile int _field1;

    public int Property1
    {
        get { return this._field1; }
        set { this._field1 = value; }
    }

    public int Property2 { get; set; }
}

Property1 is a wrapper for _field1, which has volatile modifier. Property2 is a normal auto property, which is written for comparison.

Visual Studio says _field1 can be an auto property.

Expected Behavior: This suggestion should not be shown because the field has volatile modifier.

The way to access to volatile fields is different from the way to access to normal fields. Access to volatile fields needs volatile. prefix in IL. So the field cannot be an auto property in the present case.