You can offer the best of both worlds, an interface and an 
abstract class. Implementors can ignore your abstract class 
if they choose. The only drawback of doing that is calling 
methods via their interface name is slightly slower than 
calling them via their abstract class name.

Interface is use where we known that all these functions 
which are declared in interface is implemented somewhere if 
we call that interface.and we can use abstract class where 
we don't known how it is implemented in call function.

If a class has one abstract method ,the class has to be an 
abstract class.
Methods can be implemented in abstract class.


Whereas a interface is like a abstract class...the only 
difference being that the methods are never implemented in 
Interface.

Friend access means that elements are accessible only 
within the program. Friend is the default access modifer 
for any class that does not have a modifier

Friend access means that elements are accessible only 
within the program. Friend is the default access modifer 
for any class that does not have a modifier

active reports has a better performance over crystal 
reports.

because AR or even telerik controls use ajax support not 
like crystal report

and also you can modify the schema file easily at run time.

better security.

AR is a latest version

step1) place one fileUpload control from tool box
step2) in it's Button click event
    If FileUpload1.PostedFile Is Nothing  Then
                Response.Write("no file posted")
                
            Else
               Here Convert that image as byte and pass it
to function.
                Dim con As SqlConnection
                Dim cmd As SqlCommand
                Dim ds As New DataSet

                con = New
SqlConnection(ConfigurationManager.AppSettings("connectionString"))
                cmd = New SqlCommand("insert into tablename
values(@image_in), con)
 Dim imageByte(FileUpload1.PostedFile.InputStream.Length) As
Byte
               
FileUpload1.PostedFile.InputStream.Read(imageByte, 0,
imageByte.Length)
                cmd.Parameters.AddWithValue("@image_in",
imageByte)
                con.Open()
                cmd.ExecuteNonQuery()
                con.Close()
               
                Response.Write("file is inserted")
            End If

By using Inputbox we can input the data for the textbox
By using msgbox we can show only the message.

hi my dear input box is to enter the values to the 
problem.and message box is nothing but to identify the 
values output

Input box means using the input box we can puting data and 
massage box means we can get massage through massage box.

The string will be rendered correctly if you use the right 
font, there is nothing special about barcodes.  Google and 
download the Free3Of9 font and use that.

Yes ur Rt

check the database path. u might have mentioned the drive
path which works for single computer.But for multiple
computers u hav to give application path which should be
globally declared and should write in congig file.then u can
acess it.