Technologies
Today in Engineer's World,
we are discussing ASP.NET & C# query faced by a developer in very easy way. Posted By- +Manish Kumar Gautam +LIVE VIAR +ASP.NET SOLUTIONS
How to programmatically set the ForeColor of a Label in Asp.net C#
In this, blog we are showing
you how to set the color of the label control dynamically. For this, we have
created a web form where two numbers are added and their result is printed onto
the label control.
Practical Implementation: -
Design code (dynamicSetLabelControlForeColor.aspx)
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="dynamicSetLabelControlForeColor.aspx.cs"
Inherits="dynamicSetLabelControlForeColor" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>
Online Add Two Number</h3>
<table>
<tr>
<td>
Number A:
</td>
<td>
<asp:TextBox ID="txtNumA" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Number B:
</td>
<td>
<asp:TextBox ID="txtNumB" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnAdd" runat="server" Text="ADD" OnClick="btnAdd_Click" />
</td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblMsg" runat="server"></asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
We can set the Fore Color of
a label control dynamically in 2 ways. We have shown both the options. First,
is the most common way to set the fore color of the label control. But, you can
also try the second one.
Practical Implementation:
Design code (dynamicSetLabelControlForeColor.aspx.cs)
using System;
public partial class dynamicSetLabelControlForeColor : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnAdd_Click(object sender, EventArgs e)
{
double sum = 0.00;
double a = 0.00;
double b = 0.00;
a = Convert.ToDouble(txtNumA.Text.Trim());
b = Convert.ToDouble(txtNumB.Text.Trim());
sum = a + b;
lblMsg.Text = "Sum of " + a + "
+ " + b + " = " + sum;
/*Ist
way*/
lblMsg.ForeColor = System.Drawing.Color.Green;
/*IInd
way*/
if (lblMsg.ForeColor != System.Drawing.Color.Green)
{
lblMsg.ForeColor = System.Drawing.Color.Green;
}
else
{
lblMsg.ForeColor = System.Drawing.Color.Empty;
}
}
}
OUTPUT:
Output for 1st Way
Output for 2nd Way
Drawbacks of 2nd Way:
Drawback Reason-1: For the first time, when the control reaches the line ->
if (lblMsg.ForeColor != System.Drawing.Color.Green)
The label color is empty. It sets the label color
to green. But, when you
press the ADD button for the second time. It skips,
‘if’ statement because now the label color is green so the control reaches the
else statement and set its color to empty.
Implies, method 2 sets the label color to green only for the very first time
and for the rest turn it sets their color to empty/default i.e. black.
Drawback Reason-2: The number of lines of code used is more than method 1.
For any query, comment us
below.
Related Questions: -
Q-1 What namespace contains
the color class for asp.net?
A)
using System;
B)
using System.Color;
C)
using System.Drawing;
D)
using System.ForeColor;
Ans. Option(C). using System.Drawing;
Q-2 What prefix used for
label control?
A)
lbl
B)
lab
C)
No such prefix defined for Label control
Ans. Option(A).
Keep
learning and sharing…
