How to get version of used dll

Question

I'm working on set of webparts that uses common library.
To testing deployment I need to add version info in generated html. Method that add version "watermark" to page is in common library.

So I have something like this (it is more complicated, because in common library is base class for webparts, but for this problem we can simplify it):

In control from mainAssembly.dll I'm calling OnInit method:

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protected override void OnInit(EventArgs e)  
{  
..  
    Library.AddWatermark(this);  
..  
}

and in common library I have:

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public void AddWatermark(Control ctrl)  
{    
    string assemblyVersion = GetAssemblyVersion();  
    ctrl.Controls.Add(new HiddenField { Value = string.Format("Version: {0}",   assemblyVersion ) });  
}  

So my question is: how to get version of assembly when we are in method from this assembly? (in AddWatermark)? And if it is possible to get version of caller assembly? (mainAssembly)

Answer 1

Version of caller assembly:

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Assembly assem = Assembly.GetCallingAssembly();
AssemblyName assemName = assem.GetName();
Console.WriteLine(assemName.Version.Major);
Console.WriteLine(assemName.Version.Minor);

To get version of current assembly replace first line of code with

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Assembly assem = Assembly.GetExecutingAssembly();

Answer 2

Try to use

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        Assembly.GetCallingAssembly();
        Assembly.GetExecutingAssembly();