FILE HANDLING IN ASP.NET : DELETE FROM FILE

Protected Void DeleteFromFile()

{

FileStream fr = new FileStream(Server.MapPath("temp.txt"), FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fr);
 FileStream fwt = new FileStream(Server.MapPath("abcd.txt"), FileMode.Create, FileAccess.Write);
 StreamWriter swt = new StreamWriter(fwt);
for (int i = 1; i <= total; i++)

{

if (position == i)

{

for (int j = 0; j < 5; j++) sr.ReadLine();

}

else

{

for (int j = 0; j < 5; j++) swt.WriteLine(sr.ReadLine());

}

}

swt.Flush();
sr.Close();
fr.Close();
swt.Close();
fwt.Close();
FileStream fw = new FileStream(Server.MapPath("temp.txt"), FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(fw);
FileStream frt = new FileStream(Server.MapPath("abcd.txt"), FileMode.Open, FileAccess.Read);
StreamReader srt = new StreamReader(frt);
while (!srt.EndOfStream) sw.WriteLine(srt.ReadLine());
sw.Flush();
sw.Close();
fw.Close();
frt.Close();
srt.Close();
if (position == total)

{

total--;
position = total;
            }
else

{

total--;

}

read_text(position);

}

protected void read_text(long pos)

{

FileStream fs = new FileStream(Server.MapPath("temp.txt"), FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
if (pos == 1)

{

sr.BaseStream.Seek(0, SeekOrigin.Begin);
TextBox1.Text = sr.ReadLine();
TextBox2.Text = sr.ReadLine();
TextBox3.Text = sr.ReadLine();
TextBox4.Text = sr.ReadLine();
sr.ReadLine();

}

else

{

for (int i = 0; i < (pos - 1) * 5; i++)

{

sr.ReadLine();

}

TextBox1.Text = sr.ReadLine();
TextBox2Text = sr.ReadLine();
TextBox3.Text = sr.ReadLine();
TextBox4.Text = sr.ReadLine();
sr.ReadLine();

}

sr.Close();
fs.Close();

}

FILE HANDLING IN ASP.NET : RETRIEVE DATA FROM A FILE

Protected Void RetriveFromFile()

{

position = 0;
total = 0;

FileStream fs = new FileStream(Server.MapPath("Temp/temp.txt"), FileMode.Open, FileAccess.Read);

StreamReader sr = new StreamReader(fs);
while (!sr.EndOfStream)

{

for (int i = 0; i < 5; i++)

{

sr.ReadLine();

}

total++;

}

position++;
read_text(position);

sr.Close();
fs.Close();

}

protected void read_text(long pos)

{

FileStream fs = new FileStream(Server.MapPath("temp.txt"), FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);

if (pos == 1)

{

sr.BaseStream.Seek(0, SeekOrigin.Begin);

TextBox1.Text = sr.ReadLine();
TextBox2.Text = sr.ReadLine();
TextBox3.Text = sr.ReadLine();
TextBox4.Text = sr.ReadLine();

sr.ReadLine();
            }
 else

{

for (int i = 0; i < (pos - 1) * 5; i++)

{

sr.ReadLine();

}

TextBox1.Text = sr.ReadLine();
TextBox2.Text = sr.ReadLine();
TextBox3.Text = sr.ReadLine();
TextBox4.Text = sr.ReadLine();

sr.ReadLine();

}

sr.Close();
fs.Close();

}

========================================================================

XML FILE OPERATIONS : CREATE AND INSERT IN XML FILE

protected void InsertXML(string xmlFilePath, string elements, string element)

{

 if (!File.Exists(xmlFilePath))

{

string data = "<" + elements + ">" + "</" + elements + ">";
doc.Load(new StringReader(data));
XmlElement child = doc.CreateElement(element);
child.SetAttribute("NAME", TextBox1.Text);
child.SetAttribute("CITY", TextBox2.Text);
child.SetAttribute("NUMBER", TextBox3.Text);
doc.DocumentElement.AppendChild(child);
doc.Save(xmlFilePath);
         

}

else

{

doc.Load(xmlFilePath);
XmlElement child = doc.CreateElement(element);
child.SetAttribute("NAME", TextBox1.Text);
child.SetAttribute("CITY", TextBox2.Text);
child.SetAttribute("NUMBER", TextBox3.Text);
doc.DocumentElement.AppendChild(child);
doc.Save(xmlFilePath);

}

            }