Diffrence betwwen value type and refrence Type?

Alten Chingumbra

Hi

What is difference between Value types and Reference types in VB.NET or C# (Value types VS Reference types?

Thank's Advance..........

5 Replies

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14y ago
Two simple examples for value and Reference parameters
0
Alten Chingumbra14y ago
Very nice explanation S Nayak
Thank U
0
Satyapriya Nayak14y ago
Hi Alten,

ByVal:- means passing a copy of a variable to your Subroutine. You can make changes to the copy and the original will not be altered.

ByRef:- means that you are not handing over a copy of the original variable but pointing to the original variable.Here original value will be changed.

Example:-

Dim x, y As Integer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        x = 20
        y = 30
        MsgBox("original value=" & x & " , " & y)
        change1(x)
        change2(y)
        MsgBox("changed value=" & x & " , " & y)
    End Sub
    Sub change1(ByVal x As Integer)
        x = x + 10
    End Sub
    Sub change2(ByRef y As Integer)
        y = y + 10
    End Sub

Result

original value= 20,30

changed value= 20,40

Thanks
0
Alten Chingumbra14y ago
Thank U Jinaga
0

Prasant Jinaga14y ago

Hi Alten,

value type:

when value is assigned to another variable,values are copied.
contain variable and reference type are not containing value directly in its memory.

refrence type:

when assignment between two variable accures only reference is copied value remains same.
memory is allocated in managed reference type and in value type memory allocated in stack.

Thanks,
Prasant