How To Store A Byte[] List In Viewstate

Feb 6, 2011

I want to store some byte[] to ViewState. For example I want to store a list of FileBytes. How can I do it?

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byte BlockNo = 0;
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[code]....
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I can tried save some data to ViewState, but i get this Error:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Error serializing value 'HeRMeSSAAS.BussinesProcess.BussinesServices.CandidateService' of type 'HeRMeSSAAS.BussinesProcess.BussinesServices.CandidateService.'
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get [code]...
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C# - Store A Queue In Viewstate?

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EDIT: ViewState does not change when browser is refreshed, so even if you write to viewstate it will not save the data. i am trying to store a Queue in a viewstate (to track postbacks and refreshes to stop a form from resubmitting). The Queue is only saving with a count of 1 (the first item that is added to it) no matter how many items i add.

// New Queue of strings
private Queue<string> sTemp;
private Queue<string> p_tempQue
{
set
{
ViewState["sTemp"] = value;
}
get
{
return (Queue<string>)ViewState["sTemp"];
}
}
//BasePage constructor
public BasePage()
{
//create a Queue of string
//sTemp = new Queue<string>();
this.Load += new EventHandler(this.Page_Load);
this.Init += new EventHandler(this.Page_Init);
}
//In the 'page_Init' event we have created a simple hidden field by name 'hdnGuid' which is attached to the page on the first hit itself.
protected void Page_Init(object sender, EventArgs e)
{
//initializing the hidden field
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HiddenField hdnGuid = new HiddenField();
hdnGuid.ID = "hdnGuid";
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hdnGuid.Value = Guid.NewGuid().ToString();
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Page.Form.Controls.Add(hdnGuid);
}
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protected void Page_Load(object sender, EventArgs e)
{
if(p_tempQue != null)
sTemp = p_tempQue;
else
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currentGuid.Guid = h1.Value;
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if (sTemp.Contains<string>(currentGuid.Guid))
{
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System.Web.HttpContext.Current.Items.Add("IsRefresh", true);
}
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else
{
//if the current Guid property in the GuidClass is not null or not an empty string
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if (!(currentGuid.Guid.Equals(null) || currentGuid.Guid.Equals("")))
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}
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Store Viewstate Other Than In Hidden Field

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This is what i've got so far:

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See the 'remarks' heading here: [URL]

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i want to store IQueryable value to ViewState. my code is as below:

Private
Property _Query()
As IQueryable
Get
Return
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End
Get
Set(ByVal value
As IQueryable)
ViewState("_Query") = value
End
Set

but when i run my page i get following error:

Type 'System.Data.Linq.DataQuery`1[[DynamicQueries.VW_EmployeeProfile_Filter, DynamicQueries, ersion=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' in Assembly 'System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable

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Private Shared _Query As IQueryable

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Why to Serialize an object to store in ViewState?

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I've build a class like this:

[code]....

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I have a public property that I use to store a GUID in the viewState:

Property myGUID()
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Guid
Get
Return
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Guid)
End
Get
Set(ByVal
value As
Guid)
Me.ViewState("myGUID")
= value
End
Set
End
Property

I include this code on many pages in my website...is there any way to migrate this to a common code file, so I don't have to repeat it on each page? If I try to add it to a class file, the "Me" part of course is out of scope.

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C# - How To Store An Array In A ViewState Error / Unable To Cast Object

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My code is:

[code]....

When I run the program, an error occurs:

Unable to cast object of type 'System.Collections.Generic.List`1[System.Int32]' to type System.Int32[]'.

Why does this error occur?

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I need to store viewstate in session to optimize my page performance on postback.

I am developing ASP.Net Website, using Visual Studio 2008.

I created a class named "BasePage" under "App_Code".

[Code]....

Now, I know if I inherit this class in all of my pages, that will work but I am looking to do this through Config file.

Is there any way that I can write something in Config file to use this class for all the pages?

so that if I want to remove, I can simply remove from config file and I do not need to compile my whole project again.

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Byte B = (byte)(lstEndPoints[0]); //Error Cannot Convert

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ArrayList lstEndPoints

0 element "0x01"
1 element "0x82"
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[Code]....

Then i set ImageUrl in PageLoad
[Code]....

My image datatype in database is image

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[Code].....

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Disabling Viewstate On Drop Down List Causes?

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I have a page that has two drop down lists on it and a button. All controls sit in an update panel. The first drop down list (ddl1) contains a lot of values which caused a huge viewstate so I disabled viewstate on it. In the page oninit event I populate the drop down list every time the page is posted back. This all seems to work fine, it shows all the values and I can access the selected value in my event handler.

ddl1 has the autopostback attribute set to true so when its value changes the second drop down list (ddl2) is populated with some values that depend on the selection in ddl1. This also works fine, the values in ddl2 change when I select a value in ddl1.

ddl2 does not have viewstate disabled. The button that sits under my two drop down lists is disabled by default and becomes enabled when the value of ddl2 is changed to anything except string.empty. This is where I run into problems. ddl2 does an autopostback too but it seems to lose the selected index/value. When I'm in my code to check whether to enable or disable the button the selected index is always 0 and the selected value is string.Empty.

If I enable viewstate on ddl1 this all works fine. Could anyone point me to what I'm doing wrong?

Here is the code executed by the ddl2 postback:

[Code]....

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I stored a list<mytype> object in a viewstate. Type of list<mytype> comes from a public structure which is defined at page.

When I try to convert viewstate to a list<mytype> object it cause error.

Public struct mytype
{....}
Page_load()
{ list<mytype> obj = new list<mytype>();
viewstate["mystate"]=obj
}
My_function(){
list<mytype> tempobj = new list<mytype>();
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}

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I am having an issue with dropdown list when viewstate is disabled. The selectedindexchanged event fires even for the other events on the page.

I am pasting the code bello. To reproduce the issues I am mentioning change the selected value of the dropdownlist and then click any button the selected indexchanged event fires even thought we didnot change the value.

[Code]....

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