How to Change Visible Property of ASP.NET Control at RunTime in .NET 3.5

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A Default.aspx page has some controls. Some controls visibility depends upon conditions. Here, what is tend to accomplish is change the visible property at runtime depending upon the conditional value.

Sampel Markup (Default.aspx in Static Mode)

XML

<div id="DivBtnImgCopy" runat="server" Visible = "True">
    <asp:ImageButton ID="BtnImgCopy" CssClass="image" ToolTip="Copy Mode" ImageUrl="img/tlb_img_copy.gif" runat="server" OnClientClick="CopyImage(); SelectButton(this,true);return false;" />
</div>

What I tried is write a method in code behind file and tried to get value from that method to set visible property to true or false.

CodeBehindFile (Default.aspx.cs)

C#

protected bool ShowHideButton()
    {
        bool bStatus = false;
        try
        {
            if (sCondition == "false")
            {
                bStatus = false;
            }
            else if (sCondition == "true")
            {
                bStatus = true;
            }
            return bStatus;
        }
        catch { }
    }

Sample Markup (Default.aspx in Dynamic Mode)

XML

<div id="DivBtnImgCopy" runat="server" visible = "<% =ShowHideButton() %>">
   <asp:ImageButton ID="BtnCopy" ToolTip="Copy Mode" ImageUrl="img/tlb_img_copy.gif" runat="server" />
</div>

But, Getting below error: Cannot create an object of type 'System.Boolean' from its string representation '<%=ShowHideButton() %>' for the 'Visible' property.

Any solution or work-around to accomplish this task. Need Help.

Posted 14-Nov-12 0:57am

Itz.Irshad

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Mohd. Mukhtar · Answer 1 · 2012-11-14T01:24:00

Hi,

Please update your axpx page code as below.

C#

<div id="DivBtnImgCopy"  runat="server" visible="<%# ShowHideButton()%>">
   <asp:ImageButton ID="BtnCopy" ToolTip="Copy Mode" ImageUrl="img/tlb_img_copy.gif" runat="server" />
</div>

And update code behind as below.

C#

protected bool ShowHideButton()
    {
        bool bStatus = false;
        try
        {
            if (sCondition == "false")
            {
                bStatus = false;
            }
            else if (sCondition == "true")
            {
                bStatus = true;
            }
         }
        catch { }
return bStatus;

    }

Hope this will work.

SoumenBanerjee · Answer 2 · 2012-11-14T01:19:00

Solution 1

Set boolean value on runtime so convert it at the of setting value
try like this:

<div id="DivBtnImgCopy" runat="server" visible = "<% =bool.Parse(ShowHideButton().ToString()) %>">

Posted 14-Nov-12 1:19am

SoumenBanerjee

v2

Comments

Itz.Irshad 14-Nov-12 7:49am

Got this error: Cannot create an object of type 'System.Boolean' from its string representation '<%=bool.Parse(ShowHideButton().ToString()) %>' for the 'Visible' property.

Mohd. Mukhtar · Answer 3 · 2012-11-14T22:31:00

Hi Irshad,

Please apply below trick.

C#

protected string ShowHideButton()
    {
        string bStatus = "";
        try
        {
            if (sCondition == "false")
            {
                bStatus = "none";
            }
            else if (sCondition == "true")
            {
                bStatus = "";
            }            
        }
        catch { }
        return bStatus;
    }

modify your div as below.

C#

<div id="DivBtnImgCopy">
   <asp:ImageButton ID="BtnCopy" ToolTip="Copy Mode" ImageUrl="img/tlb_img_copy.gif" runat="server" />
</div>

<script type="text/javascript">
document.getElementById("DivBtnImgCopy").style.display = "<%=ShowHideButton() %>";       
</script>

How to Change Visible Property of ASP.NET Control at RunTime in .NET 3.5

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