Reading a file from SharePoint Document Library

string content = string.Empty;
using (SPSite oSite = new SPSite("http://localhost/"))
{
using (SPWeb oWeb = oSite.OpenWeb())
{
SPDocumentLibrary doclib = (SPDocumentLibrary)oWeb.GetList(DocLibUrl);
SPFile htmlFile = doclib.Items[0].File;
using (System.IO.StreamReader reader = new System.IO.StreamReader(htmlFile.OpenBinaryStream()))
{
content = reader.ReadToEnd();
}
}
}