C# - Save Dialog Box Through Javascript?

I am using javascript to open save dialog box

the java script is

function openDialog(path)
{
document.execCommand("SaveAs",true,path);
}

In my project, i am creating linkButtons dynamically and attaching this function with linkButton's OnClient Click event at run time.

LinkButton linkButton = new LinkButton();
linkButton.OnClientClick = "openDialog("+file.ToString()+")";

where "file" contains the path of the file which has to be saved.

But i am getting a javascript error as

"Expected ")" "

I have N number of dynamically created linkButtons and i am associating each linkButton with different file.