'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";
}
The key step was to set the textbox ID manually, it seems that if this is not done it is the root of the error.
Read the complete post at http://blogs.blackmarble.co.uk/blogs/rfennell/archive/2008/07/23/unable-to-find-control-when-programmatically-adding-asp-net-validation-controls.aspx