Can't access mainwindow class from page?

Question

i have wpf app which have a mainwindow.xaml and a pages/page1.xaml .Page display on window using frame .window contain a textbox and when i try to give value to this textbox from page1 on button click then nothing happen in textbox . so what should i do?

i am using that code on button click-
Mainwindow.xaml
<Window x:Class="pp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:v="clr-namespace:pp.Pages"
Title="MainWindow" MinHeight="350" MinWidth="525"
Background="Transparent">
<Grid>
<TextBox Width="100" Height="40" Name="textbox1"/>
<Frame NavigationUIVisibility="Hidden" Name="Mainframe" Source="pages/page1.xaml" Margin="40"></Frame>
</Grid>
</Window>

Page1.xaml
<Page x:Class="pp.FileView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:v="clr-namespace:pp.Pages"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
Title="FileView">

<Grid >
<Button Width="100" Height="40" Name="Btn" Click="Btn_click"/>
</Grid>
</page>

Page1.xaml.cs
private void Btn_Click(object sender, RoutedEventArgs e)
{
MainWindow mw=new MainWindow();
mw.textbox1.Text="hello";
}

Piyush Pansuriya · Answer

Hello as per your code you are initializing new MainWindow(). So its basically two mainwindow you have been created. Solution : When MainWindow Load set this in GlobleClass (Static Common Class for all). And give textbox value to that instance. i.e. public static class GlobleClass { public static MainWindow uc_ MainWindow; } void MainWindow_Loaded(object sender RoutedEventArgs e) { GlobleClass. uc_ MainWindow = this; } Page1.xaml.cs private void Btn_Click(object sender RoutedEventArgs e) { GlobleClass. uc_ MainWindow .textbox1.Text=hello; }

Piyush Pansuriya · Answer

Hello Same thing you are repeating again.!! You are initializing class 2 times. so its two different classes. if you want to pass value to page2 you have to declare variable in page2. page1.xaml.cs public page1() { InitializeComponent(); page2.content = Hello; } page2.xaml.cs public string content { get; set; } public page2() { InitializeComponent(); this.textbox=content; }

Suraj Sararf · Answer

thanks piyush ! its work very well. i have one more problem in property. i set some value in property on page1 and when call it in page2 then property doesn't have any value. so what should i do? variable.cs public class Variable { public string content { get; set; } } page1.xaml.cs public page1() { InitializeComponent(); Variable v=new Variable(); v.content=hello; } page2.xaml.cs public page2() { InitializeComponent(); Variable v=new Variable(); this.textbox=v.content; } But textbox doesn't have any value.