hi,

I want to create a dynamic array which will contain string......then dynamically I will add strings to the array....At the end how i will retrieve strings from that array......

for example....i have a textbox, a button named add, and a button named show...... 1st i will write some string in the textbox....whene i click on the ADD button.the string wriiten in the textbox will be added to the array.....again i will write another string in textbox...again click the ADD button....that will be added to the array.................

so at the end when i click on the SHOW button, I want to see all the strings which i have entered.........

Code behind should be as : 

Sub AddButton_Click(ByVal sender As Object,ByVal e As System.EventArgs)

Dim sMyArray As String= New String()

sMyArray()=TextBox1.Text

End Sub

Sub ShowButton_Click(ByVal sender As Object,ByVal e As System.EventArgs)

Dim Value As String

For Each value As String In sMyArray

Response.Write(value)

Next

End Sub

for dynamic allocation of a list of objects you need to use either generics or ArrayList 

if we used generics plus session to maintain the value between postbacks the code beside would be something like:

using System.Collections.Generic;
using System;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
    private List<string> ResultArray
    {
        get
        {
            if (Session["resultArray"] == null)
                Session["resultArray"] = new List<string>();
            return (List<string>)Session["resultArray"];
        }
    }
   
    protected void btnAdd_Click(object sender, EventArgs e)
    {
        ResultArray.Add(txtNewText.Text);
        txtNewText.Text = string.Empty;
    }
    protected void btnShow_Click(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        foreach (string s in ResultArray)
        {
            sb.Append("<br />" + s);
        }
        lblResultingText.Text = sb.ToString();
    }
}

From a UI perspective, why wouldn't you use a text input + a select?  The select would hold the individual strings and have the added bonus of displaying them and letting you delete specific ones.