DataTable do not get updates?

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C#

ASP.NET

DataTable

I have a DataTable with one column filled with list of words from a text file, I create a method to read a string if the string is founded the row must be deleted, but the problem is that the DataTable don't get the updates.

foreach(string line in file)
{
   tagst.Rows.Add(line)
}

string s;
for (int k = 0; k < tagst.Rows.Count; k++)
{
   s = tagst.Rows[k]["Tags"].ToString();
   if(s.Equals("Jad"))
   {
      tagst.Rows[k].Delete();
   }
}