asp.net - How to validate an ajax combobox with empty text? -


how should validate if ajax combobox contains text? have tried asp.net requiredfieldvalidator dosen't work.

if found solution here: http://ajaxcontroltoolkit.codeplex.com/workitem/24417

had add javascript change controltovalidate property internal textbox.

string script = string.format(@"if({0}) {0}.controltovalidate = ""{1}_textbox"";", this.reqvalidator.clientid, this.ddlcombo.clientid);  scriptmanager.registerstartupscript(this, this.gettype(), string.format("validator trick {0}", this.clientid), script, true);

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