Question

There is a MenuItem click event MainMenu_Define_Material which opens a window called Material. I get info from a textbox called txt_density and I save that info in density and return to main window via OK-button having click event Material_btn_OK_Click.

My question is, how I can avoid passing the last session values every time I open the window Material?

I want, once density is set, every time I open Material window I want to see the values of previous session.

private void MainMenu_Define_Material(object sender, RoutedEventArgs e)
{
    newWin_material = new Material();            

    newWin_material.btn_OK.Click += new RoutedEventHandler(Material_btn_OK_Click);            

    if (density != -1)
    {
        newWin_material.txt_density.Text = density.ToString();            
    }

    newWin_material.ShowDialog();
}

private void Material_btn_OK_Click(object sender, RoutedEventArgs e)
{
    density = System.Convert.ToSingle(newWin_material.txt_density.Text);    
    newWin_material.Close();            
}

Answer 1

Not very clear where that density comes from, but you can insert that field in uour data class what you can hold on data layer or may be like ObjectDataProvider for modelview.

There are a lor of different solutioms our there. The basic idea is:

Define common, shared data storage and keep there alll values you want to share between different windows.

Define a data class. I used here a static class with a static member Desnity.

public static class DataClass 
{
     public static double Desnsity;
}

After in any window you’re able to access that field (read/write), like

DataClass.Density

Hope this is clear.