public partial class Default2 : System.Web.UI.Page
{
string minima = "Good Evening";
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack) {
        TextBox1.Text = minima;
       ViewState["Count"] = 0;

    }
    Label1.Text = "Currently online " + Convert.ToString(ViewState["UserCount"]) + " users";
    Label2.Text = "Clicks from previous users: " + ViewState["Count"].ToString();
}

protected void Button1_Click(object sender, EventArgs e)
{

    TextBox2.Text = TextBox1.Text;
    ViewState["Count"] = Convert.ToInt32(ViewState["Count"]) + 1;
    Label3.Text = "Curent Clicks: " + Convert.ToString(ViewState["Previous"]);
}