When button clicked class properties dont change else reload same class in ASP.NET

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when button clicked class properties dont change else reload same class in asp.net c# codebehind

 <div class="demo" id ="demo" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <asp:Button ID="BtnDemo" runat="server" OnClick="BtnDemo_Click" />
</asp:UpdatePanel>
</div>

i just want button clicked div class demo activate in codebehind in asp.net but i have tried all the methods but just cant do it. Ples anyone help. Thanks for your support.

protected void BtnDemo_Click(object sender, EventArgs e)
{
    if (BtnDemo_Click.Text == "Next")
    {
        demo.Attributes.Add("class", "demo");        
        demo.Visible = true; 
        
    }
}

What I have tried:

protected void BtnDemo_Click(object sender, EventArgs e)
{
    if (BtnDemo_Click.Text == "Next")
    {
        demo.Attributes.Add("class", "demo");        
         demo.Visible = true;  
        
    }
}

Posted 12-Jul-22 7:58am

Vinoth S 2022

Updated 15-Jul-22 8:57am

v3

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Comments

0x01AA 12-Jul-22 14:06pm

And you are sure that


       1. -- demo.Attributes.Add("class", "demo");        
        2. -- demo.Visible = true;
        3. -- demo.Style("display") = "none";
        4. -- demo.Attributes("style") = "display:block";
        5. -- demo.Attributes("class") = " ";
        6. -- demo.Attributes.Remove("class");

compiles?

Vinoth S 2022 12-Jul-22 14:12pm

protected void BtnDemo_Click(object sender, EventArgs e)
{
if (BtnDemo_Click.Text == "Next")
{
demo.Attributes.Add("class", "demo");
demo.Visible = true;

}
}

Vinoth S 2022 12-Jul-22 14:14pm

i have upload the question for example purpose only. but i need when button clicked class properties in div dont change else reload same class when button clicked in asp.net c# codebehind

2 solutions

Solution 2

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<div class="demo" id ="demo" runat="server">
   <asp:Button ID="BtnDemo" runat="server" OnClick="BtnDemo_Click" />
</div>
</asp:UpdatePanel>
</div>

when i used inside updatepanel demo class shouldnot change how to do it

Posted 15-Jul-22 8:57am

Vinoth S 2022

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Richard Deeming · Accepted Answer · 2022-07-12T23:50:00

Solution 1

An UpdatePanel only updates the elements within the panel. Since your demo element is outside of the panel, changes to that element made during a partial postback will not have any effect.

Understanding Partial Page Updates with ASP.NET AJAX | Microsoft Docs[^]

Posted 12-Jul-22 23:50pm

Richard Deeming