C# DataBinding does not contain a property with the name with custom class object and CheckBoxList

I get the error "DataBinding: class1 does not contain a property with the name prop1"

public class1 {

  public string prop1;

  public string prop2;

}

My setup was an object array of class1 which has a property prop1 and prop2:

class1[] arrClass = new class1[arraySize];

Then I set the DataTextField and DataValue:

checkboxlist1.DataSource = arrClass;

checkboxlist1.DataTextField = "prop1";

checkboxlist1.DataValueField = "prop2";

checkboxlist1.DataBind();

This throws the error above. The fix is the lack of accessors in the class, class1. The class should be corrected to the following:

public class1 {

  public string prop1 { get; set; }

  public string prop2 { get; set; }

}

 Technically, set is not needed.

Reference

https://msdn.microsoft.com/en-us/library/aa287786%28v=vs.71%29.aspx