If we have a web page in which any simple control is present for example a TextBox
<asp:TextBoxID="TextBox1"runat="server"Text=""></asp:TextBox>
Now in code file a public variable is defined like
publicstring txtValue ="Khan";
Now I want to assign thetxtValue inText filed of TextBox Just like
<asp:TextBoxID="TextBox1"runat="server"Text="<%=txtValue%>"></asp:TextBox>
But this approach is not working.
Can anyone tell it?
Modify your markup to:
<asp:TextBox ID="TextBox1" runat="server" Text='<%# GetValue %>' />
Then you should make an at least protected function in your code behind to return the string:
protected string GetValue(){return txtValue;}
I have tried it but it is getting error.
Please check it on you own side.
This syntax should work. I've used it a dozen times in my apps.
What is the error you're getting?
Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
publicpartialclass_Default : System.Web.UI.Page
{
privatestring txtValue ="Zeeshan";protectedstring GetValue()
{
return txtValue;
}
}
Default.aspx
<%@.PageLanguage="C#"AutoEventWireup="true"CodeFile="Default.aspx.cs"Inherits="_Default"Debug="true" %>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>Untitled Page</title>
</head>
<body>
<formid="form1"runat="server">
<div>
<asp:TextBoxID="TextBox1"runat="server"Text="<%# GetValue %>"></asp:TextBox>
</div>
</form>
</body>
</html>
And the error which I am getting is
Error 1 The best overloaded method match for 'System.Convert.ToString(object, System.IFormatProvider)' has some invalid arguments D:\New Project\dawateislamix.net\Default.aspx 12
Error 2 Argument '1': cannot convert from 'method group' to 'object' D:\New Project\dawateislamix.net\Default.aspx 12
Can you try with<asp:TextBoxID="TextBox1"runat="server"Text="<%# GetValue() %>"></asp:TextBox>
Modify your html as follows:
<asp:TextBoxID="TextBox1"runat="server"Text="<%# GetValue() %>"></asp:TextBox>
There is not any error now.
But still the value is not passed to the control.
Pls try to set the value in
Page_Load() event.
txtValue ="Zeeshan" ;
Default2.aspx
<%@.PageLanguage="C#"AutoEventWireup="true"CodeFile="Default2.aspx.cs"Inherits="Default2" %>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>Untitled Page</title>
</head>
<body>
<formid="form1"runat="server">
<div>
<asp:textboxID="Textbox1"runat="server"Text="<%# GetValue() %>"></asp:textbox>
</div>
</form>
</body>
</html>
Default2.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
publicpartialclassDefault2 : System.Web.UI.Page
{
privatestring txtValue;protectedstring GetValue()
{
return txtValue;
}
protectedvoid Page_Load(object sender,EventArgs e)
{
txtValue ="Zeeshan";
}
}
Please check it.
It still does not show the text.
sorry guys its as simple as this
in your code behind you have this
publicpartialclasscodedisplay : System.Web.UI.Page
{
privatestring txtValue ="Zeeshan";protectedvoid Page_Load(object sender,EventArgs e)
{
TextBox1.Text = txtValue;
}
}
and in your aspx you have this
<asp:TextBoxID="TextBox1"runat="server"/>
with all form and html elements.
Good luck
You can do it in your code behind instead of in your markup:
protectedvoid Page_Load(object sender,EventArgs e)
{
if (!IsPostBack)
TextBox1.Text = GetValueStr();
}
privatestring txtValue ="test";protectedstring GetValueStr()
{
return txtValue;
}
But If I want to do it on Mark up then.
Well if you want to do it on mark up then, put it straight in
text="Zeeshan"
text is a property and hence
Don't use code blocks in ASPNET. Avoid if you can avoid it because they are written for backward compatability; instead write an event handler or startup routine in the codebehind which populates the property on the control as necessary.
For example, you could do it in Page_Load - but be sure to surround it with if (! PostBack) so that the value doesn't get overwritten when posting back.
In late binding controls i.e. say a textbox in a gridview etc, you can databind but that again uses reflection etc and hence is slow.
Hi,
If you have to do it in the markup use single quotes instead Text='<%=MyPublicVariable %>'
HTH
