asp textbox vs input type="text"

I have a form that inputs data. When I submit the text from the input type="text" it makes it into the database but when I try to input text from theasp textbox I get an error saying that a value for that field is expected. I'm trying to use a RequiredFieldValidator for those fields but I'm unable to for theinput type="text" field. 

Any help is appreciated, thanks.