gauthee wrote:

i have used the process and process start info objects and could complete the task bu the constraint is while printing the original file is being opened!

ObjectQuery qry = new ObjectQuery("SELECT * FROM Win32_PrintJob");<br />
ManagementObjectSearcher srchr = new ManagementObjectSearcher(qry);<br />
ManagementObjectCollection coll = srchr.Get();<br />
<br />
int initialJobs = coll.Count;<br />
<br />
while (coll.Count == initialJobs)<br />
{<br />
  System.Threading.Thread.Sleep(10);<br />
  coll = srchr.Get();<br />
}

DataSet ds1 = new DataSet(), ds2 = new DataSet();
DataTable t1 = ds1.Tables.Add();			
DataTable t2 = ds2.Tables.Add();
for (int i = 1; i <= 2; i++) {
	t1.Columns.Add("C" + i.ToString(), typeof(int));
	t2.Columns.Add("C" + i.ToString(), typeof(int));				
}
for (int i = 0; i <= 5; i++) {
	t1.Rows.Add(new object[] { i, i});
}
for (int i = 0; i <= 100; i++) {
	t2.Rows.Add(new object[] { i, i });
}
for (int i = 0; i < 5; i++) {
	DataRow[] good = t2.Select("(C1 = '" + t1.Rows[i][0].ToString() + "') AND (C2 = '" + t1.Rows[i][1].ToString() + "')");
	if (good.Length > 0) { 
		// (...)
	}
}

Virtual functions

When you have a function defined in a class which you want to allow to be implemented by the inherited classes you can use virtual function.
The virtual function could be implemented by the inherited classes in their own way and the call to the method is decided at runtime.

New Modifier

The new modifier creates the New instance(object) of the class