accessing a web user control in master page from code behind

Question

4.00/5 (1 vote)

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Hi,i have a web user control called StudentsPanel in my master page.I have placed it under the login view as shown below.I need to access it from code behind in my page so as i can disable it.Have used the code below but i end up getting null results.Can anyone tell me how to access the web user control in my master page?Thanks,Below is where i have placed the control in master page

XML

<asp:LoginView ID="LoginView1" runat="server">
                  <RoleGroups>
                <asp:RoleGroup Roles="Students">
                    <ContentTemplate>
                     <uc1:studentPanel runat="server" ID="students_control" />
                    </ContentTemplate>
                     </asp:RoleGroup>

                </asp:RoleGroup>
            </RoleGroups>
        </asp:LoginView>

Here is the code am using in my page

C#

LoginView control;

            Page page = (Page)this.Page;
            MasterPage master = (MasterPage)page.Master;

          control= (LoginView)master.FindControl("students_control");[/B]

                       if (control!= null)
                       {
                           Label1.Text = "found";
                       }

Posted 26-Jan-14 19:33pm

Member 10398773

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3 solutions

Solution 1

Hello,

I think you didnt register you user control in the master page,

<%@ Register TagPrefix="UserControl" TagName="YourUsercontrol" src="~/YourUsercontrol.ascx" %>

All the best:)

Posted 26-Jan-14 19:46pm

karthik Udhayakumar

v2

Comments

Member 10398773 27-Jan-14 1:49am

Its already registered really

Member 10398773 28-Jan-14 7:57am

Hi,this has not solved it

karthik Udhayakumar 28-Jan-14 8:32am

hi,I guess you got the solution now!

Member 10398773 28-Jan-14 8:53am

Yes really.Thank you much.I have used KARTHIK code.Thanks

Solution 3

Try using FormCollection class to access the controls.Like this

C#

[HttpPost]
       public ActionResult Login(LoginModel model, FormCollection collection)
       {
           string userName = collection["txtUsername"];
           string password = collection["txtPassword"];

}

This may help.

Posted 26-Jan-14 20:44pm

Gitanjali Singh

Comments

NF Khan 23-Aug-14 13:14pm

Similarly i have a user control in which i have DropDown, I am trying to accessing the DropDown items in Master page code behind but i am not able to get it, Below is my code use

Site.Master
<%@ Register TagPrefix="uc" TagName="MyDDL" Src="~/MyUC.ascx" %>
<uc:MyDDL runat="server" ID="SelectDDL" />

Site.Master.cs
DropDownList thisDropDown = this.Master.FindControl("SelectDDL") as DropDownList;

Please help how can i achieve this. I am getting NullException Error.

Thanks in advance

Member 10398773 25-Aug-14 2:52am

I will try and update if i succeed on that

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Karthik_Mahalingam · Accepted Answer · 2014-01-26T19:48:00

Solution 2

you need to cast it to type studentPanel

C#

control= (studentPanel)master.FindControl("students_control");

Check it.

Posted 26-Jan-14 19:48pm

Karthik_Mahalingam

Comments

Member 10398773 27-Jan-14 1:54am

Hi,this has returned to me null

Karthik_Mahalingam 27-Jan-14 2:03am

try this
LoginView lv = (LoginView)master.FindControl("LoginView1");
var some = (studentPanel)lv.FindControl("students_control") ;

Member 10398773 28-Jan-14 8:21am

Sir,i salute you really.Your code has worked like a charm.Wow!i spend nites thinking about this.The part i can ask you is whether i can add some items on it depending on different user.

Karthik_Mahalingam 28-Jan-14 8:36am

if it helps pls mark it as answer..
yes you can add.

Member 10398773 28-Jan-14 8:44am

cool.i will try that now.Saw it by using loadcontrol method

Karthik_Mahalingam 28-Jan-14 8:50am

ok

Member 11154161 5-Nov-14 1:16am

hi

NF Khan 24-Aug-14 7:03am

Similarly i have a user control in which i have DropDown, I am trying to accessing the DropDown items in Master page code behind but i am not able to get it, Below is my code use

Site.Master
<%@ Register TagPrefix="uc" TagName="MyDDL" Src="~/MyUC.ascx" %>
<uc:MyDDL runat="server" ID="SelectDDL" />

Site.Master.cs
DropDownList thisDropDown = this.Master.FindControl("SelectDDL") as DropDownList;

Please help how can i achieve this. I am getting NullException Error.

Thanks in advance