how to access master page control from content page

Question

I have a master page which contains a label for status messages  I need to set the status text from different  aspx pages   How can this be done from the content page   public partial class Site   System Web UI MasterPage       public string StatusNachricht               get                       return lblStatus Text                    set                       lblStatus Text   value                       protected void Page Load object sender  EventArgs e                               I have tried this  but was unsuccessful in making it work   public partial class DatenAendern   System Web UI Page       var master   Master as Site       protected void Page Load object sender  EventArgs e                               if  master    null                        master setStatusLabel                                   protected void grdBenutzer RowCommand object sender  GridViewCommandEventArgs e                               try                                 some code                  if  master    null                                        master setStatusLabel  Passwort erfolgreich ge  ndert                                                 catch  Exception ex                                if  master    null                                        master setStatusLabel  Passwort konnte nicht ge  ndert werden

User · Answer

I have a helper method for this in my System.Web.UI.Page class

protected T FindControlFromMaster<T>(string name) where T : Control
{
     MasterPage master = this.Master;
     while (master != null)
     {
         T control = master.FindControl(name) as T;
         if (control != null)
             return control;

         master = master.Master;
     }
     return null;
}

then you can access using below code.

Label lblStatus = FindControlFromMaster<Label>("lblStatus");
if(lblStatus!=null) 
    lblStatus.Text = "something";

User · Answer

It Works  To find master page controls on Child page   Label lbl UserName   this Master FindControl  lbl UserName   as Label                      lbl UserName Text   txtUsr Text

User · Answer

In Content page you can access the label and set the text such as  Here  lblStatus  is the your master page label ID   Label lblMasterStatus    Label Master FindControl  lblStatus     lblMasterStatus Text     Meaasage from content page

User · Answer

If you are trying to access an  html element  this is an HTML Anchor      My nav bar has items that are not list items   lt li gt   but rather html anchors   lt a gt     See below   This is the site master      lt nav class  mdl-navigation  gt       lt a class  mdl-navigation  link  href    runat  server  id  liHome  gt Home lt  a gt       lt a class  mdl-navigation  link  href    runat  server  id  liDashboard  gt Dashboard lt  a gt   lt  nav gt    Now in your code behind for another page  for mine  it s the login page      On PageLoad   define this    HtmlAnchor lblMasterStatus    HtmlAnchor Master FindControl  liHome    lblMasterStatus Visible  false   HtmlAnchor lblMasterStatus1    HtmlAnchor Master FindControl  liDashboard    lblMasterStatus1 Visible   false    Now we have accessed the site masters controls  and have made them invisible on the login page

User · Answer

In the MasterPage cs file add the property of Label like this   public string ErrorMessage       get               return lblMessage Text            set               lblMessage Text   value            On your aspx page  just below the Page Directive add this    lt    Page Title    Language  C   MasterPageFile  Master Path Name         gt   lt    MasterType VirtualPath  Master Path Name    gt       Add this   And in your codebehind aspx cs  page you can then easily access the Label Property and set its text as required  Like this   this Master ErrorMessage    Your Error Message here

User · Answer

This is more complicated if you have a nested MasterPage  You need to first find the content control that contains the nested MasterPage  and then find the control on your nested MasterPage from that   Crucial bit  Master Master   See here  http   forums asp net t 1059255 aspx Nested master pages and Master FindControl  Example       Find the content control        Dim ct As ContentPlaceHolder   Me Master Master FindControl  cphMain         now find controls inside that content        Dim lbtnSave As LinkButton   ct FindControl  lbtnSave

User · Answer

You cannot use var in a field  only on  local variables    But even this won t work   Site master   Master as Site    Because you cannot use this in a field and Master as Site is the same as this Master as Site  So just initialize the field from Page Init when the page is fully initialized and you can use this   Site master   null   protected void Page Init object sender  EventArgs e                    master   this Master as Site

[asp.net] how to access master page control from content page

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