How do I send a string or value from the Site.Master.cs to my Default.aspx.cs to the value/string in a label/textbox?

Question

Thanks for reading. I want to set the value obtained in Label1 (in Site.Master.cs) to be passed on to Label2 (in Default.aspx.cs). I want to use it as a value to cross reference data in an SQL db later on in the project.

I just can't seem to get my head around this one.

In Site.Master.cs

namespace flexpoolWeb
{
    public partial class SiteMaster : MasterPage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            var windowsIdentity = HttpContext.Current.User.Identity;

            if (windowsIdentity == null)
                throw new InvalidOperationException("WindowsIdentity is null");

            string nameWithoutDomain = HttpContext.Current.User.Identity.Name.Split('\\').Last();
            //serverside code httpContext haalt ingelogde gebruiker op in de sessie.

            Label1.Text = String.Format(nameWithoutDomain);

            Label2.Text = MyMaster.UserName;

        }
        public string UserName
        {
            get { return Label1.Text; }
            set { Label1.Text = value; }
        }
    }
}

In Default.aspx.cs:

namespace flexpoolWeb
{
    public partial class _Default : System.Web.UI.Page //instead of : Page
    {
        private SiteMaster MyMaster => ((SiteMaster)Master);

    }
}

Thanks in advance.

Edit: added the answer from Skye MacMaster

Answer 1

Your master page is derived from MasterPage. So you need to type cast Master from MasterPage to whatever the name your master is. I'm guessing Site or SiteMaster. Also, I usually create a private property to avoid having a bunch of ugly typecasting.

public partial class Default : System.Web.UI.Page
{
    private SiteMaster MyMaster => ((SiteMaster) Master);

    protected void Page_Load(object sender, EventArgs e)
    {
        Label2.Text = MyMaster.UserName;
    }
}