Moving codebehind to class

Still getting used to using classes and want to know how to move this code to a class and call it in my code behind to prevent redundancy in my web application. The code I'm strying to put is duplicated in several files:
private void LoadDataToEdit(string formControlName, string formTextData) { switch (formControlName) { case "txtCommitteeName": txtCommitteeName.Text = formTextData; break; case "txtIdNum": txtIdNum.Text = formTextData; break; case "txtAid": txtAid.Text = formTextData; break; case "txtAdate": txtAdate.Text = formTextData; break; case "txtAname": txtAname.Text = formTextData; break; case "txtAamount": txtAamount.Text = formTextData; break; case "txtAtotal": txtAtotal.Text = formTextData; break; case "txtBid": txtBid.Text = formTextData; break; ...