open form onClick

I created a form and added some buttons. when I click the button labeled "RESIDENTS". I want to open that form. I started this by inserting another form which is currently labeled Form2 but I changed the property under Design to "residents". I double clicked the "residents" button in Form1 and inserted this code

Code:

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private void residentsBtn_Click(object sender, EventArgs e)
        {
            var residents = new Form2();
            residents.Show();
        }

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the error says, "type or Namespace could not be found

See
https://docs.microsoft.com/en-us/dot...essages/cs0246
https://www.codeproject.com/Question...d-not-be-found