I have the problem to use webdropdown,

I found webdropdown_selectedchanged event on events queue, it fires utile another bostback. even I set attribute postback= true for select change.   I really want to know why??

Thnaks.

Martin

Still getting the Oject not set to an instance of an object error.

Here is the Button click Even that fires to update the DB

  protected void btnAddPM_Click(object sender, EventArgs e)
            {
                WebDropDown ddlAddPM = (WebDropDown)gvPM.Rows[0].FindControl("ddlAddPM");
                 AddRole(int.Parse(ddlAddPM.SelectedValue), "pm");
                 BindUpdatedGrid(((GridView)gvPM.Rows[0].FindControl("gvPMDetails")), "pm");
            }

Here is the function called from the page load to Bind the DDL's

 private void PopulateDDLs()
            {
                WebDropDown ddlAddContracts = (WebDropDown)gvContracts.Rows[0].FindControl("ddlAddContracts");
                WebDropDown ddlAddSubcontracts = (WebDropDown)gvSubcontracts.Rows[0].FindControl("ddlAddSubcontracts");
                WebDropDown ddlAddFinance = (WebDropDown)gvFinance.Rows[0].FindControl("ddlAddFinance");
                WebDropDown ddlAddPM = (WebDropDown)gvPM.Rows[0].FindControl("ddlAddPM");
                WebDropDown ddlAddBilling = (WebDropDown)gvBilling.Rows[0].FindControl("ddlAddBilling");
                WebDropDown ddlAddConsultant = (WebDropDown)gvConsultant.Rows[0].FindControl("ddlAddConsultant");
                WebDropDown ddlAddCorporateSecurity = (WebDropDown)gvCorporateSecurity.Rows[0].FindControl("ddlAddCorporateSecurity");
                WebDropDown ddlAddCustomer = (WebDropDown)gvCustomer.Rows[0].FindControl("ddlAddCustomer");
                WebDropDown ddlAddExternal = (WebDropDown)gvExternal.Rows[0].FindControl("ddlAddExternal");
                WebDropDown ddlAddLegal = (WebDropDown)gvLegal.Rows[0].FindControl("ddlAddLegal");
                WebDropDown ddlAddPricing = (WebDropDown)gvPricing.Rows[0].FindControl("ddlAddPricing");

                List<User> users = ContractInfo.ScrubAllUserNames();

                List<User> usedUsers = ContractInfo.GetScrubbedUsersByContract(_conId);
                var userIds = (from u in usedUsers
                               select u.id);

                List<User> remainingUsers = (from u in users
                                             where !userIds.Contains(u.id)
                                             select u).ToList();


                ddlAddPM.DataSource = ddlAddContracts.DataSource = ddlAddSubcontracts.DataSource = ddlAddConsultant.DataSource =
                    ddlAddFinance.DataSource = ddlAddBilling.DataSource = ddlAddConsultant.DataSource = ddlAddPricing.DataSource =
                    ddlAddCorporateSecurity.DataSource = ddlAddCustomer.DataSource = ddlAddExternal.DataSource = ddlAddLegal.DataSource =
                    remainingUsers;
               
                ddlAddPM.DataBind();
                ddlAddContracts.DataBind();
                ddlAddSubcontracts.DataBind();
                ddlAddFinance.DataBind();
                ddlAddBilling.DataBind();
                ddlAddConsultant.DataBind();
                ddlAddCorporateSecurity.DataBind();
                ddlAddCustomer.DataBind();
                ddlAddExternal.DataBind();
                ddlAddLegal.DataBind();
                ddlAddPricing.DataBind();

                ddlAddPM.Items.Insert(0, new DropDownItem("", ""));
                ddlAddContracts.Items.Insert(0, new DropDownItem("", ""));
                ddlAddSubcontracts.Items.Insert(0, new DropDownItem("", ""));
                ddlAddFinance.Items.Insert(0, new DropDownItem("", ""));
                ddlAddBilling.Items.Insert(0, new DropDownItem("", ""));
                ddlAddConsultant.Items.Insert(0, new DropDownItem("", ""));
                ddlAddCorporateSecurity.Items.Insert(0, new DropDownItem("", ""));
                ddlAddCustomer.Items.Insert(0, new DropDownItem("", ""));
                ddlAddExternal.Items.Insert(0, new DropDownItem("", ""));
                ddlAddLegal.Items.Insert(0, new DropDownItem("", ""));
                ddlAddPricing.Items.Insert(0, new DropDownItem("", ""));
            }

Hi,

I am not sure where is your PopulateDDLs() method called. Since you are calling DataBind() there, you should make sure it is called before the Button Clicked event handler. I tried this code and it works fine :

    protected void Page_Load(object sender, EventArgs e)

    {

        WebDropDown1.DataBind();

    }

    protected void Unnamed2_Click(object sender, EventArgs e)

    {

        string selVal = WebDropDown1.SelectedValue;

    }

Thanks,

Angel 

that works as long as view state is not disabled on the webdropdown. 

PopulateDDLs is called on the PageLoad

Hi,

In my example ViewState is disabled, and this works fine. In fact if ViewState is Enabled, it's not needed to DataBind on every postback, only on the first page load.

Thanks,

Angel 

Angel, you have been EXTREMELY helpful!  thank you very much.

I was binding on the initial, but not the post back. 

Thank you again!

I am marking this as fixed.  Would it be possible for you to look at my thread about not getting all of the images imported?

this is my last thing for this particular page

http://forums.infragistics.com/forums/t/26721.aspx