Preserve View State value at post back

Hi All,

   I am creating a custom server control.That control contains a check box list. For the first time I am getting value for that check box list, at run time through Get/Set property. In Property I am using View state for setting value. While page is post back, the view state is getting null. How can I preserve the value of view state. Sample code is as follows,


private CheckBoxList _chkList;

protected override void CreateChildControls()


string strItems;

string[] StrArrItem = null;

char cSplitChar = ',';

int intLegth = 0;

_chkList = new CheckBoxList();

_chkList.ID = "DDList";

_chkList.BorderColor = Color.White;

_chkList.BorderStyle = BorderStyle.Solid;

_chkList.Width = Unit.Percentage(100);

strItems = List;

StrArrItem = strItems.Split(cSplitChar);

intLegth = StrArrItem.Length;


for (int i = 0; i < intLegth; i++)







public string List





strValue = ViewState[
if (strValue.Length > 0)


strValue = strValue.Length > 0 ? strValue.Substring(0, strValue.Length - 1) : strValue;



return strValue;




"Value"] = null;

strValue += value + ",";

ViewState["Value"] = strValue;




Can anybody help me pleaseeeeSad

1/20/2009 4:46:17 AM 93655 articles. 6 followers. Follow

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