problem in read the data from text file and raise the error "can not find central directory"

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C#

my code like as

private void btnOnlineSubmit_Click(object sender, EventArgs e)
       {
           string dpath = @"E:\ClusterGroups";
           DirectoryInfo d1 = new DirectoryInfo(dpath);
           DirectoryInfo[] d2 = d1.GetDirectories("*.*");
           foreach (DirectoryInfo d3 in d2)
           {
               filecnt = d2.Length;
               string DeleteFPath = "";
               FileInfo[] filenames = d3.GetFiles("*.*");

               for (int i = 0; i <= filenames.Length - 1; i++)
               {



                   Fileinfo f1 = new Fileinfo();
                   Fileinfo f2 = new Fileinfo();
                   f1.Ffullname = filenames[i].FullName;

                   f1.Fextension = filenames[i].Extension;

                   string fs = "";
                   string fs1 = "";

                   if (filenames[i].Extension == ".pdf" && FExtension == ".pdf")
                   {

                       fs = ExtractTextFromPdf(f1.Ffullname);
                       fs1 = Extract(OPath);

                   }
                   else if (filenames[i].Extension == ".txt" && FExtension == ".txt")
                   {

                 <pre lang="c#">      fs = File.ReadAllText(f1.Ffullname);

fs1 = File.ReadAllText(OPath);
}
else if (filenames[i].Extension == ".docx" && FExtension == ".docx")
{
TextExtractor extractor = new TextExtractor(f1.Ffullname);
TextExtractor extractor1 = new TextExtractor(OPath);
fs = extractor.ExtractText();
fs1 = extractor1.ExtractText();
}




in this above code first problem is reads the data from text file

fs = File.ReadAllText(f1.Ffullname);

this above statment not read the content from text file.this statement read the datetime only.i had found by break points.
fs string read datetime.this can be found by breakpoint only
please slove the probelm

another problem is raise error like as

"cannot find central directory"

this error raise at

fs = extractor.ExtractText();

if u want to read the data from .docx file use the namespace i.e

using Code7248.word_reader;

in this textextrator added in library.

please help me.