Linkbutton in ASP.NET does not have onclick event on backend

I am trying to dynamically create a list of link buttons. I need the link buttons to have an onclick event. When I try to add the onclick event in C#, I get this error:

The name OnClick does not exist in the current context.

This is my code:

protected void fillList()
{
    List<PdfInfo> pdf = new List<PdfInfo>();
    pdf.Add(new PdfInfo { Path =  @"c:\TestCode\TestPdfs\", PdfName = "testPdf1.pdf"  });
    pdf.Add(new PdfInfo { Path = @"c:\TestCode\TestPdfs\", PdfName = "testPdf1.pdf" });
    pdf.Add(new PdfInfo { Path = @"c:\TestCode\TestPdfs\", PdfName = "testPdf1.pdf" });

    List<LinkButton> x = new List<LinkButton>();

    foreach(PdfInfo i in pdf)
    {
        x.Add(new LinkButton { ID = i.PdfName, Text = i.PdfName, OnClientClick = "linkBtnNewTab();", OnClick +="" });
    }
}

Is there no way to add an onclick event handler dynamically?