public partial class GenerateEventForms : System.Web.UI.UserControl
    {

        public event EventHandler OnGenerateFormsClick
        {
            add
            {
                btnSubmitRequest.Click += value;
            }
            remove
            {
                btnSubmitRequest.Click -= value;
            }
        }

    }

this.generateForms.OnGenerateFormsClick += this.GenerateFormsClick;

<uc1:GenerateForms ID="generateForms" runat="server" OnGenerateFormsClick = "GenerateFormsClick" />