setting attributes or css of button in code behind in aspx

Question

here is my aspx code for buttons

<div id="navigationButtons">
                <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" CssClass="button submit" Enabled="true" />   
                <asp:Button ID="btnNext" name="btnNext" Text="NEXT" ToolTip="Next" runat="server" CssClass="button next" TabIndex="0" OnClick="btnNext_Click" Enabled="false"/>
                <asp:Button ID="btnPrev" Text="PREV" ToolTip="Previous" runat="server" CssClass="button prev" TabIndex="2" OnClick="btnPrev_Click" Enabled="true"/>
                <asp:Button ID="btnExit" Text="EXIT" ToolTip="Exit" runat="server" CssClass="button exit" TabIndex="3" OnClick="btnExit_Click" />
        </div>

I am unable to change the attributes from code behind so I browsed for the solution and some blogs suggested using following code in the code behind.

((System.Web.UI.HtmlControls.HtmlElement)Page.Form.FindControl("btnNext")).Style.Add("visible", "false");

I have already tried btnNext.Enabled=false; it is not working. but when I use it there is null exception error in the code. I don't know how to fix this in the above code behind. Any solution is appreciated. thanks.

What does this have to do with Classic ASP? Classic ASP and ASP.NET are NOT the same thing - more like distant cousins, at best. — Tim
– Tim, Commented Sep 11, 2013 at 6:37

Tadit Dash · Accepted Answer · 2013-09-11 06:52:27Z

1

I just used the aspx code which you have provided. Note that I don't have the cssClass specified for the buttons.

Now on Submit Button Click Event, I wrote the following code.

btnNext.Visible = false;

And it disables the Button. So, some other factor is creating problems for you.

First of all, try this on a new page without adding any css files. It will work. Then try adding that css files or classes and check if they are creating problems or not.

answered Sep 11, 2013 at 6:52

Tadit Dash

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3 Comments

Tadit Dash Over a year ago

Ok Try like below by removing the cssClass...

<asp:Button ID="btnNext" name="btnNext" Text="NEXT" ToolTip="Next" runat="server" TabIndex="0" OnClick="btnNext_Click" Enabled="false"/>

Tadit Dash Over a year ago

You did not get me. I said to remove the cssClass and use

<asp:Button ID="btnNext" name="btnNext" Text="NEXT" ToolTip="Next" runat="server" TabIndex="0" OnClick="btnNext_Click" Enabled="false"/>

Then in code behind, try btnNext.Visible = false;

Tadit Dash Over a year ago

Can you post the whole page code by editing the Question? As I suggested before, have you tried on a different page with only these buttons and the code btnNext.Visible = false?

Andi Krusch · Accepted Answer · 2013-09-11 06:36:47Z

1

You can access the button with it's ID, so you can do something like this:

btnNext.Visible = false;

Have you already tried this?

answered Sep 11, 2013 at 6:36

Andi Krusch

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2 Comments

Sanjay Maharjan Over a year ago

btnNext.Visible = false; is not working thats why I was trying to use the above code

Andi Krusch Over a year ago

So instead of Style.Add you should try btnNext.Attributes["style"] = "visibility: hidden";

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