Event Handling in ASPX

public delegate void PersonHandler(object sender,EventArgs e);
public event PersonHandler CountrySelectedIndexChange;
public event PersonHandler StateSelectedIndexChange;
public event PersonHandler btnUploadClick;
public event PersonHandler btnSubmitClick;

protected virtual void rcbCountryName_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
    {
        if (this.CountrySelectedIndexChange != null)
        {
            this.CountrySelectedIndexChange(sender, e);
        }
    }
    protected void rcbStateName_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
    {
        if (this.StateSelectedIndexChange != null)
        {
            this.StateSelectedIndexChange(this,e);
        }
    }