ASP.NET判断控件类型

public void ChangeRepeaterStatus(string rpID)
        {
            for (int i = 0; i < this.divPanel.Controls.Count; i++)
            {
                    //if (this.divPanel.Controls[i].GetType().FullName == typeof(Repeater).FullName)
                    if (this.divPanel.Controls[i] is Repeater)
                    {
                        Repeater rpControl = this.divPanel.Controls[i] as Repeater;
                        if (rpControl.ID == rpID)
                        {
                            rpControl.Visible = true;
                        }
                        else
                        {
                            rpControl.DataSource = null;
                            rpControl.DataBind();
                            rpControl.Visible = false;
                        }
                    }
            }
        }

public static void ClearTextBox(Control c) 
        {
            foreach(Control control in c.Parent.Controls)
            {
                 if (control is TextBox)
                 {
                     ((TextBox)control).Text = string.Empty;
                 }
            }
        }