How to save Array in View State? And Retrieve That in ASP.NET?

Question

I am using Asp.Net With JqueryMobile (C#). I declare string[] roomno = new string[100]; in my Class.

In Page_load Event:-

if (!Page.IsPostBack)
{
    Some Code...
     for (int j = 0; j <= vallen; j++)
     {
         roomno[j] = "A" + Convert.ToString(j + 1);
     }
    Some Code,..
}

When I Click The Button The Array values is clear. So I wanna know How to save Array in View State? And Retrieve That in ASP.NET?

Antony Scott · Accepted Answer · 2012-02-18 04:23:30Z

4

ViewState["some_key"] = roomno;

roomno = ViewState["some_key"] as string[];

or words to that effect :)

edited Feb 18, 2012 at 4:23

answered Feb 18, 2012 at 4:16

Antony Scott

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3 Comments

Sagotharan Over a year ago

I tried this but,.. Cannot implicitly convert type 'object' to 'string[]'. An explicit conversion exists (are you missing a cast?) Error is Coming in roomno = ViewState["some_key"];. how to cast?

Sagotharan Over a year ago

I know only Convert.Tostring. Thanks.

Antony Scott Over a year ago

see the 'as string[]' bit i added to the answer. that is bascially casting to viewstate 'object' to a 'string []', but if the object isn't castable to a 'string []' then you will et a null value rather than an InvalidCastException. So, you may have to do a null check in your code.

Jerry Lopez · Accepted Answer · 2018-01-02 23:20:21Z

0

ViewState["SomeKey"] = (string[])roomno;
roomno = (string[])ViewState["SomeKey"];

Or to initialize

string[] roomno = string[0]; 
ViewState.Add("SomeKey", roomno);

answered Jan 2, 2018 at 23:20

Jerry Lopez

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