Object reference not set to an instance of an object.?

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Hi, I'm getting an "Object reference not set to an instance of an object" in the following code (inside Page_Init):

C#

DynaControlsBLL objDyn = new DynaControlsBLL();
HtmlGenericControl dynDiv = new HtmlGenericControl();
//this line m getting error..
objDyn.GenerateTabControls("FS_TaxiMenu", out dynDiv, out gListDynamicControls, true, false, false);
phDynamic.Controls.Add(dynDiv); 
Session["gListDynamicControls"] = gListDynamicControls;

Does anyone have any ideas what the problem could be.

Posted 3-May-12 23:09pm

ythisbug

Updated 3-May-12 23:44pm

Pete O'Hanlon

v4

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Comments

Mohammad A Rahman 4-May-12 5:24am

It is really hard to understand what is happening out there by looks of line of code and little description. Please describe bit more.

ythisbug 4-May-12 5:33am

DynaControlsBLL objDyn = new DynaControlsBLL(); HtmlGenericControl dynDiv = new HtmlGenericControl(); objDyn.GenerateTabControls("FS_TaxiMenu", out dynDiv, out gListDynamicControls, true, false, false); phDynamic.Controls.Add(dynDiv); Session["gListDynamicControls"] = gListDynamicControls;

this is dat code in pageinit

Mohammad A Rahman 4-May-12 5:47am

From the code what I can see, GenerateTabControls method takes 6 parameters, out of 6 dynDiv has been instantiated where is gListDynamicControls coming from?
And please show us the details about the exception program throws....

ythisbug 4-May-12 5:51am

List<dynacontrolspl> gListDynamicControls = new List<dynacontrolspl>();
this is the class to retrieve dynamictable column details..

Mohammad A Rahman 4-May-12 5:56am

As Solution 2 suggested, please debug the code. If you have difficulties to find where is the exception coming from try using try..catch block to identify the method where is the exception raised from :)

ythisbug 4-May-12 5:59am

ok thanks alot..

Mohammad A Rahman 4-May-12 6:05am

Happy to help dude but in this circumstance it bit hard Sorry about that. All the best :)

NOTE: Or you could perhaps show use Page_Init method contents and the method which contains the code you showed in here.

ythisbug 4-May-12 6:09am

ok thanks again.this is page init
protected void Page_Init(object sender, EventArgs e)
{

if (!IsPostBack)
{
////...
//SessionManager.CurrentDocType = "FS_TaxiMenu";
//Session["gListDynamicControls"] = gListDynamicControls;
//gListDynamicControls = (List<dynacontrolspl>)Session["gListDynamicControls"];
//gListDynamicControls.Clear();
////...

Session["files"] = gListFiles;
gListFiles = (List<fileuploadpl>)Session["files"];
gListFiles.Clear();

Session["CategoryRelations"] = gListCategoryRelations;
gListCategoryRelations = (List<categoryrelationspl>)Session["CategoryRelations"];
gListCategoryRelations.Clear();

CategoryBLL categoryBLL = new CategoryBLL();
Session["dataTableGridData"] = categoryBLL.GetCategory();

SessionManager.MasterAdd = false;
SessionManager.MasterDelete = false;
SessionManager.MasterEdit = false;
SessionManager.RightAction = false;
GetMasterFormActions();
//************* *****************
Session["gListDynamicControls"] = gListDynamicControls;
gListDynamicControls = (List<dynacontrolspl>)Session["gListDynamicControls"];
gListDynamicControls.Clear();
//************* *****************
SetupPrintGrid();
}
//bool varIsCreate = true;
//bool varIsAction = false;

DynaControlsBLL objDyn = new DynaControlsBLL();
HtmlGenericControl dynDiv = new HtmlGenericControl();
objDyn.GenerateTabControls("FS_TaxiMenu", out dynDiv, out gListDynamicControls, true, false, false);
//objDyn.GenerateTabControls(SessionManager.CurrentDocType, out dynDiv, out gListDynamicControls, varIsCreate, varIsAction, false);

phDynamic.Controls.Add(dynDiv);
Session["gListDynamicControls"] = gListDynamicControls;

//if (!IsPostBack)
{
////////////////
DropDownList cmbCurrency = (DropDownList)Page.FindControl("radcmbCatCurrency");
if (cmbCurrency != null)
{
hidCurrencyComboID.Value = cmbCurrency.ClientID;
cmbCurrency.Attributes.Add("onblur", "GetCurrencyRate();");
}
TextBox txtCurrencyRate = (TextBox)Page.FindControl("radtxtCurrencyRate");
if (txtCurrencyRate != null)
{
decimal amountForeign = 0;
decimal currencyRate = 0;

hidCurrencyRate2.Value = txtCurrencyRate.ClientID;
}
}

}

Mohammad A Rahman 4-May-12 6:24am

Sorry dude, no idea what's going on? Please debug your self. Hope you solve the issue :)

ythisbug 4-May-12 5:42am

FS_TaxiMenu this name records i added in dynamicform tble

2 solutions

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Sangramsingh Pawar · Answer 1 · 2012-05-03T23:17:00

Solution 1

Check that you used new key word to create objDyn onject

C#

classname objDyn = new objDyn();

Posted 3-May-12 23:17pm

Sangramsingh Pawar

Comments

ythisbug 4-May-12 5:33am

your talking about this code
DynaControlsBLL objDyn = new DynaControlsBLL();
HtmlGenericControl dynDiv = new HtmlGenericControl();
objDyn.GenerateTabControls("FS_TaxiMenu", out dynDiv, out gListDynamicControls, true, false, false);
phDynamic.Controls.Add(dynDiv);
Session["gListDynamicControls"] = gListDynamicControls;

Pete O'Hanlon · Answer 2 · 2012-05-03T23:42:00

Solution 2

I think you'll find that the line you think you are getting the error on is not actually where the error is:

C#

objDyn.GenerateTabControls("FS_TaxiMenu", out dynDiv, out gListDynamicControls, true, false, false);

I rather suspect that the error is inside the method GenerateTabControls. If you put a breakpoint on this code and step into this method, you should be able to identify the line that is really throwing the exception.

Posted 3-May-12 23:42pm

Pete O'Hanlon

Comments

ythisbug 4-May-12 5:57am

i put breakpoint and in gListDynamicControls am getting count is 2
and dynDiv is null

Pete O'Hanlon 4-May-12 6:01am

Actually step into the method. You need to see what's going on in GenerateTabControls as that's where your error is coming from. This method is returning you a null dynDiv which you attempt to add as a control, so there's something going wrong in there.

ythisbug 4-May-12 6:12am

ok thanks hanlon