How can I check whether the user actually clicked "save" and not "cancel"?

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ASP.NET

How can I check whether the user actually clicked "save" and not "cancel"?

Files can be downloaded fine but I need to write to a Database after the user saves a file but dont want to write to it if they click cancel and dont actually save the file.

Basically something like:

Response.ContentType = "application/ms-excel";
Response.AddHeader("content-disposition", "inline; file1.xls");
Response.WriteFile(randomFileName); 

If(user clicked cancel)
{
    // Do nothing
}
else if (user clicked save)
{
    // write to a database
}