I'm using .NET 1.1

I have a form class called BaseForm, and I create a subclass of BaseForm called SubclassForm.

In the constructor of Baseform, I add text to the end of the Text property:

public class BaseForm:Form
{
   public BaseForm(string sSuffix)
   {
      this.Text+=sSuffix;
   }
}

public class SubclassForm:BaseForm
{
   public SubclassForm(string sSuffix):base(sSuffix)
   {
      
   }
}

In the designer, I change the Text property of SubclassForm to "SubclassForm", but when I instantiate SubclassForm, it uses the Text property of BaseForm rather than SubclassForm (IOW, it adds the passed string to the value from BaseForm.Text rather than SubclassForm.Text)

I would override the Text property in your form and see who is setting it to what and why. 

public override string Text { 
   get { return base.Text; }
   set { base.Text = value; } // <-- put a breakpoint here or MessageBox.Show(new StackTrace().ToString());
}

But the problem is that it is using the inherited value of BaseForm.Text ("BaseForm") rather than the overriden Text ("SubclassForm") property in SubclassForm.

I've even moved the code to the Load of BaseForm, but the same thing happens.

I would override the Text property in your form and see who is setting it to what and why. 

public override string Text { 
   get { return base.Text; }
   set { base.Text = value; } // <-- put a breakpoint here or MessageBox.Show(new StackTrace().ToString());
}