'Unable to find control' when programmatically adding ASP.NET validation controls
I have been building a webpart that needs client side validation. I kept getting the error: “Unable to find control id txtNotes referenced by the ‘ControlToValidate’ property” Now most of the posts say just use the command to get the ‘real’ ID at runtime this.rfvNotes.ControlToValidate = this.txtNotes.ClientID; But this did not work, in the end the form I found worked was: protected override void OnInit(EventArgs e) { base.OnInit(e); this.txtNotes.ID = “txtNotes”; this.rfvNotes.ControlToValidate = this.txtNotes.ID; this.rfvNotes.Enabled = true; this.rfvNotes.Text = “* Required”; } ...