How to Resolve "Please Make Sure That the File Is Accessible and That It Is a Valid Assembly or Com Component"

How do I resolve Please make sure that the file is accessible and that it is a valid assembly or COM component?

the file is a native DLL which means you can't add it to a .NET project via Add Reference... you can use it via DllImport (see http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.dllimportattribute.aspx)

Failed to add reference to 'DocuSign.eSign'. Please make sure that the file is accessible, and that it is a valid assembly or COM component

This is a bug, I can reproduce. We will be working on it and I'll update when we have a fix.

UPDATE: this has been fixed with a new release today of https://www.nuget.org/packages/DocuSign.eSign.dll/5.4.1

A reference to the dll could not be added

I used dependency walker to check out the internal references the dll was having. Turns out it was in need of the VB runtime msvbvm60.dll and since my dev box doesnt have that installed I was unable to register it using regsvr32

That seems to be the answer to my original question for now.

Error referencing DLL in C# A reference to xxx.DLL could not be added

Include your dll in your project then embedd it as a resource, and choose to copy it to output directory if newer or always: https://static1.squarespace.com/static/508eb96ae4b047ba54db4e47/t/519e1809e4b01e6a03d7f51b/1369315338280/properties.png?format=750w

Then use platform invoke:

[DllImport("nameofyourdll.dll")]
public static extern void methodnameinyourdll(string param1, string param2);
public static void Main() 
{
    methodnameinyourdll("test1", "test2");
}

Sometimes you may have to use native types but they are not compatible with CLR to avoid that use Marshalling:
https://www.codeproject.com/articles/66245/marshaling-with-csharp-chapter-1-introducing-marsh.aspx

Error on add reference to SQLite.Interop.dll

Add the package using NuGet

Install-Package System.Data.SQLite

It will download and add the appropriate references for SQLite. It looks like you are trying to add the wrong references. You should be adding references to binaries like the Core / EF6 / Linq from the SQLLite binaries.

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