How to resume StreamReader to start reading from continue.

Question

Actually I have an application in that I'm reading Stream data using StreamReader line to line and Inserting into Data Base If any Case Internet Connection Closed or system shutdown then i want to resume Stramreader don't want to read from starting Position of the Stream.

Stream stream = res.GetResponseStream();
using (StreamReader sr = new StreamReader(stream))
{
int i = 1;
int j = 0;
string ss = "";
List<string> strContent = new List<string>();
while (i > j)
{
StringBuilder sb = new StringBuilder();
while (!sr.EndOfStream)
{
string line = sr.ReadLine();
ss = ss + line;
i++;
if (line.Equals("</record>"))
{
if ((sr.EndOfStream))
{
}
else
{
ss = ss + "</records>";
}
var mySourceDoc = new XmlDocument();
//load the file from the stream
mySourceDoc.LoadXml(ss);
//XmlNode nd = mySourceDoc.DocumentElement.SelectSingleNode("//records");
XmlDocument xmlAPDP = new XmlDocument();
xmlAPDP.LoadXml(ss);
XmlNodeReader xmlReader = new XmlNodeReader(xmlAPDP);
DataSet dataSet = new DataSet();
dataSet.ReadXml(xmlReader);
string sds = WriteXML(dataSet);
ss = "";
ss = "<?xml version='1.0' encoding='utf-8'?><records xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation ='premium-world-check.xsd'>";
j = i;
i = j + 1;
break;
}
}
if ((sr.EndOfStream))
{
break;
}
}
}