Implement visitors count using C# in ASP.Net

Hi avika,

Use Global.asax to set the count.

Refer below code.

Global.asax

void Application_Start(object sender, EventArgs e)
{
    Application["VisitorsCount"] = 0;
}

void Session_Start(object sender, EventArgs e)
{
    Application.Lock();
    Application["VisitorsCount"] = (int)Application["VisitorsCount"] + 1;
    Application.UnLock();
}

HTML 

<asp:Label ID="lblCount" runat="server" />

Code

protected void Page_Load(object sender, EventArgs e)
{
    lblCount.Text = Application["VisitorsCount"].ToString();
}