Get Logged in UserName and Sign out in Forms Authentication in ASP.Net

Hi nauna,

Please refer below sample.

HTML

Login.aspx

<asp:Login ID="Login1" runat="server" OnAuthenticate="ValidateUser">
</asp:Login>

Home.aspx

<div>
    <asp:Label ID="lblUserName" runat="server" /><br />
    <asp:LinkButton Text="Logout" runat="server" OnClick="Logout" />
</div>

Namespaces

C#

using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Web.Security;

Code

C#

Login.aspx.cs

protected void ValidateUser(object sender, EventArgs e)
{           
    int userId = 0;
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("Validate_User"))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@Username", Login1.UserName);
            cmd.Parameters.AddWithValue("@Password", Login1.Password);
            cmd.Connection = con;
            con.Open();
            userId = Convert.ToInt32(cmd.ExecuteScalar());
            con.Close();
        }
        switch (userId)
        {
            case -1:
                Login1.FailureText = "Username and/or password is incorrect.";
                break;
            case -2:
                Login1.FailureText = "Account has not been activated.";
                break;
            default:
                FormsAuthentication.RedirectFromLoginPage(Login1.UserName, Login1.RememberMeSet);
                break;
        }
    }
}

Home.asp.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.Page.User.Identity.IsAuthenticated)
    {
        FormsAuthentication.RedirectToLoginPage();
    }
    string username = HttpContext.Current.User.Identity.Name;
    lblUserName.Text = "Login User Name is : <b>" + username + "</b>";
}

protected void Logout(object sender, EventArgs e)
{
    FormsAuthentication.SignOut();
    FormsAuthentication.RedirectToLoginPage();
}

Screenshot