public static void ClearForm(System.Windows.Forms.Control parent)
        {
                foreach (System.Windows.Forms.Control ctrControl in parent.Controls)
                {
                    //Loop through all controls
 
                 if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.TextBox)))
                 {
                      //Check to see if it's a textbox
                      ((System.Windows.Forms.TextBox)ctrControl).Text = string.Empty;
                            //If it is then set the text to String.Empty (empty textbox)
                  }
                  else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RichTextBox)))
                  {
                       //If its a RichTextBox clear the text
                       ((System.Windows.Forms.RichTextBox)ctrControl).Text = string.Empty;
                  }
                  else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.ComboBox)))
                  {
                       //Next check if it's a dropdown list
                       ((System.Windows.Forms.ComboBox)ctrControl).SelectedIndex = -1;
                            //If it is then set its SelectedIndex to 0
                  }
                  else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.CheckBox)))
                  {
                       //Next uncheck all checkboxes
                       ((System.Windows.Forms.CheckBox)ctrControl).Checked = false;
                  }
                  else if (object.ReferenceEquals(ctrControl.GetType(), typeof(System.Windows.Forms.RadioButton)))
                  {
                       //Unselect all RadioButtons
                       ((System.Windows.Forms.RadioButton)ctrControl).Checked = false;
                  }
                  if (ctrControl.Controls.Count > 0)
                  {
                      //Call itself to get all other controls in other containers
                      ClearForm(ctrControl);
                  }

        protected void OnValueChanged(object sender, EventArgs e)
        {
            ViewState["IsModified"] = true;
        }
 
        protected void SubscribeForOnChange(Control parent)
        {
            foreach (Control ctrControl in parent.Controls)
            {
                //Loop through all controls
                if (object.ReferenceEquals(ctrControl.GetType(), typeof(TextBox)))
                {
                    ((TextBox)ctrControl).AutoPostBack = true;
                    ((TextBox)ctrControl).TextChanged += new EventHandler(OnValueChanged);
                }
...
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {            
            if (!IsPostBack && wizSummaryDetails.ActiveStep == wizStepSummary)
            {
                ViewState["IsModified"] = false;
                SubscribeForOnChange(this);
...

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