How to get data from other class in C#

Question

Hi,
I'm new to C#. I have two pages in my UWP app. I need to get a data from a variable of other class(page). I always get zero when I try to read the variable. Please have a look at my below code.

namespace PROJECT
{
public sealed partial class MainPage : Page
    {
      public static int var;  // data stores in this variable. 

      public MainPage()
        {
           this.InitializeComponent();
        } 
        public void function()
        {
            var = 4;
        }
    }
}

In the above class. The variable var will set with the value 4. I want to get this data as soon as I navigate to other page. The other class is like below.

namespace PROJECT
{
public sealed partial class SecondPage : Page
    {

      public SecondPage()
        {
           this.InitializeComponent();
           int data = MainPage.var;
          System.Diagnostics.Debug.WriteLine(data); // here I always get 0

        } 
        public void function_secondpage()
        {
             int data = MainPage.var;
             System.Diagnostics.Debug.WriteLine(data); // here I get 4
        }
    }
}

I need to get the data from variavle var as soon as I navigate to the second page. I need to show that data on the second page. However, I always get 0.
I could read the data from the variable var correctly when I call the function function_seconfpage(). However, this wont help me. How can I read the data from varaible var successfully when I navigate to the second page?. Thank you in advance.

Answer 1

Use a overload for the constructor

namespace PROJECT
{
 public sealed partial class SecondPage : Page
 {
 private int _initialValue;

       public SecondPage()
       {
            this.InitializeComponent();


       } 
 public SecondPage(int inComing)
 {
 this.InitializeComponent();
 _initialValue = inComing;

           System.Diagnostics.Debug.WriteLine(inComing); // here I always get 0

       } 
       public void function_secondpage()
       {
 System.Diagnostics.Debug.WriteLine(inComing); // here I get 4
       }
     }
}