This is very simple and easy:
The sample code is as follows:

using System;
using System.IO; //Namespaces needs for file Input/Output Operation
namespace FILEIO
{
public partial class Form1 : Form
{
private void button1_Click(object sender, EventArgs e)
{
StreamWriter iSW = new StreamWriter(@"C:\Target.txt" ); // Open the target text file to write
iSW.Write(textBox1.Text); // write the text to the file
iSW.Close(); // close the stream writer
}
}
}

This is very simple and easy:
The sample code is as follows:

using System;
using System.IO; //Namespaces needs for file Input/Output Operation
namespace FILEIO
{
public partial class Form1 : Form
{
private void button1_Click(object sender, EventArgs e)
{
StreamWriter iSW = new StreamWriter(@"C:\Target.txt" ); // Open the target text file to write
iSW.Write(textBox1.Text); // write the text to the file
iSW.Close(); // close the stream writer
}
}
}

There are two Magic Tables in SQL Server:
1. INSERTED:- This table is created when a trigger is created on a table for Insert and Update.
1. DELETED:- This table is created when a trigger is created on a table for Update and Delete.
More important .NET Questions & Answer

The INSERTED and DELETED tables are called Magic tables which are maintained by sql server. When a table is updated, the affected row is inserted in the DELETED table and the new row is inserted in the INSERTED table before the updation process. When a row is inserted in a table the INSERTED table is populated and when a row is deleted from a table the DELETED table is populated.