Master page how to hide div of master page in particular webform ASP.NET C# error

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Header.master--->page

ASP.NET

<asp:ContentPlaceHolder ID="cntplcDiv" runat="server"
<div runat="server" id="divCmptMenu">
    <ul id="nav">
                <li><asp:HyperLink ID="hypLnkhome" runat="server" NavigateUrl="~/Admin_Home.aspx">Home</asp:HyperLink></li>
                <li><asp:HyperLink ID="hypLnkconfigSettng" runat="server" >Config & Settings</asp:HyperLink>
                    <ul class="subs">
                        <li><asp:HyperLink ID="hypLnkUsrStng" runat="server" NavigateUrl="~/ListUsers.aspx">User Settings</asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkprdStng" runat="server" Text="Production Settings"></asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink1" runat="server" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkEmailTmp" runat="server" >Email Templates</asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink4" runat="server" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkTaxSttng" runat="server" Text="Tax Settings" NavigateUrl="~/TaxSetting.aspx" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink5"  runat="server" ></asp:HyperLink></li>
                    </ul>
                </li>
 </div>
  
<asp:ContentPlaceHolder>

Header.master.cs

C#

protected void Page_Load(object sender, EventArgs e)
    {

CheckForEstPage();

}

    public void CheckForEstPage()
    {
        try
        {
            String path = HttpContext.Current.Request.Url.AbsolutePath;
            System.Web.UI.HtmlControls.HtmlGenericControl currdiv = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("divCmptMenu");

            if (path == "~/EstimateForms.aspx")
            {
                currdiv.Style.Add("display", "none");
                // currdiv.Visible = false;
            }

        }
        catch (Exception expM)
        {
            Response.Write(expM.Message);
        }
    }

plz help me with the coding i want to hide the masterpage div in particular webpage(for in ex. estimateform)... i have tried a lot of coding... i am getting error
"Object reference not set to an instance of an object. "
thank u...

What I have tried:

???

Posted 18-Apr-13 23:23pm

Member 9467059

Updated 24-Feb-17 4:46am

Bryian Tan

v3

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4 solutions

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Faisal(mfrony) · Answer 1 · 2013-04-18T23:31:00

Solution 1

You can try this

this.Page.Master.FindControl("Id of control that have runat=server")

Posted 18-Apr-13 23:31pm

Faisal(mfrony)

TrushnaK · Answer 2 · 2013-04-19T01:51:00

Solution 3

find a master page control from content page like this:-

//your div should contain the property
 runat="server"
 
//finding the div associated with id 
System.Web.UI.HtmlControls.HtmlGenericControl currdiv = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("divid");
 
//hiding the div
 currdiv.Style.Add("display", "none");

or try this:-

HtmlGenericControl Divid = (HtmlGenericControl)Page.Master.FindControl("MainDiv").FindControl("Divid");
 Divid.Visible = false;

Posted 19-Apr-13 1:51am

TrushnaK

Updated 19-Apr-13 2:03am

v2

Comments

Member 9467059 19-Apr-13 9:01am

sorry pals still getting same error...
and div is not getting invisible when itz in estimatefrom.aspx...
plz help me with it its urgent

TrushnaK 19-Apr-13 9:06am

on which line you get error.

Member 9467059 22-Apr-13 1:34am

protected void Page_Load(object sender, EventArgs e)
{

CheckForEstPage();

}
public void CheckForEstPage()
{
try
{
String path = HttpContext.Current.Request.Url.AbsolutePath;

till executing here its going to catch block..
error"Object reference not set to an instance of an object."

Abhai Oza · Answer 3 · 2013-04-18T23:55:00

Solution 2

[^]

http://www.w3schools.com/aspnet/aspnet_masterpages.asp[^]

Posted 18-Apr-13 23:55pm

Abhai Oza

DataBlind · Answer 4 · 2017-02-24T04:42:00

Hello everybody! Well, in my case, I had two divs inside another one, I had been trying to hide them, so, I used this code and works perfectly:

protected void Page_Load(object sender, EventArgs e)
       {
         var HideDiv= this.Master.FindControl("MainDiv");

           if (HideDiv != null)
           {
               HtmlGenericControl InsideDiv_1 = (HtmlGenericControl)HideDiv.FindControl("InsideDiv1");
               HtmlGenericControl InsideDiv_2 = (HtmlGenericControl)HideDiv.FindControl("InsideDiv2");
               if (InsideDiv_1 != null)
               {
                   InsideDiv_2.Visible = false;
                   InsideDiv_1.Visible = false;
               }
           }
       }
   }

Good Luck.