Update zip file based on other zip file C#

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C#

WPF

So i have a zip file in a directory. This zip file contains different kind of files. When a user clicks on a button in my WPF application, the zip file needs to be updated.

It needs to check files from another zip file in another directory. If a file doesnt excist in the first zip file, it needs to copy that file from the other zip file to the new zip file.

i used the Ionic zip methode for this.

So far i just used the file.copy overwrite = true code. But when the zip file is 1gb+ it is taking very long because it just replaced the zip file.

does someone know how i can resolve this?

Greetings Thomas

What I have tried:

this is the code i got so far:

private void getlocaldata()
{

string admindata = @"\\networklocation\test.zip";
string localPath = @"C:\finaldata\test.zip";

File.Copy(admindata, localPath, true);

}