How can I change the color of text and background in C#?

Joe Wilson

Hi,

I mean I want to make a windows form in C# like below:

this is my form

color: color number (0 - 255)

(for example if all of the color number get 0 except green the text will be green and the contrast color (red) will be background color)

Note: the green and blue and red that were shown below are labels and the numbers in front of labels are text box which can be changed and the text which is green is a text box which must have contrast color with the background color .

For example:

green 255

blue 0 Text

red 0

18 Replies

Know the answer? Post it — somebody with the same question will find it here.

Joe Wilson10y ago
Thank you all my friends that helped me more.
0
Roshan Guragain10y ago
```
label1.ForeColor=System.Drawing.Color.Pink;
```
wherelabel1 is the name of labelon the form
+1
Roshan Guragain10y ago
```
label1.ForeColor=System.Drawing.Color.Pink;
```
wherelabel1 is the name of labelon the form
+1
Guest User10y ago
https://msdn.microsoft.com/en-us/library/aa288405(v=vs.71).aspx
-1
Joe Wilson10y ago
Thank you for your answer, I have another question :the background color of form and the randomText that it is in the code are inversion?
0
Amit Gupta10y ago
@Joe, As already mentioned, you cannot use class or struct. Message is a struct and that cannot be used to change the color.
ControlName.ForeColor = Color.FromArgb(255, red, green, blue)
where ControlName is the name of your label or textbox.
As your current code is working fine.
+1
Joe Wilson10y ago
this is my code please check that is it work properly .
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms.VisualStyles;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Color_Conversion
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void label2_Click(object sender, EventArgs e)
{
}
private void Red_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor = Color.FromArgb(255, red, green, blue);
randomText.ForeColor = Color.FromArgb(255, red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor = bgColor;
}
private void Blue_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor = Color.FromArgb(255, red, green, blue);
randomText.ForeColor = Color.FromArgb(255, red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor = bgColor;
}
private void Green_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor = Color.FromArgb(255, red, green, blue);
randomText.ForeColor = Color.FromArgb(255, red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor = bgColor;
}
0
Joe Wilson10y ago
Thank you very much for your answer, but the problem is not the number of the parameters the problem is this:
Message.ForeColor = Color.FromArgb(255, red, green, blue);
error: 'System.windows.forms.Message' does't contain a definition for forecolor .
the problem is that forecolor is not defined although I have used "usingSystem.windows.forms " so do you think why it is not defined ?
by the way, I used this.backcolor instead form1.backcolor and problem get solved.
0
Amit Gupta10y ago
Hi Joe
-- @
Hi, Thank you for your answers, but the error it gives me for lines that are highlighted is this:
Message.ForeColor = Color.FromArgb(red, green, blue);
'System.windows.forms.Message' does't contain a definition for forecolor .
--
You have to use the control name, where Message depicts class here.
If you have to change the ForeColor or BackColor of label or a textbox, use the following snippet
ControlName.ForeColor = Color.FromArgb(255, red, green, blue)
where ControlName is the name of your label or textbox.
Hope it helps
+2
Joe Wilson10y ago
Hi, Thank you for your answers, but the error it gives me for lines that are highlighted is this:
Message.ForeColor = Color.FromArgb(red, green, blue);
'System.windows.forms.Message' does't contain a definition for forecolor .
0
Amit Gupta10y ago
Hi Joe
As per your error shown in red color, the ARGB function takes 4 parameters including alpha, red, green, blue. You had passed only 3 parameters

Message.ForeColor = Color.FromArgb(red, green, blue);

Use instead

Message.ForeColor = Color.FromArgb(255, red, green, blue);

It will rectify your error.

However, you can use centralized event for better code maintainability, if you are writing same snippets for 3 times.

Moreover, your function for inverting color is ok, you can also change the sequence of rgb to invert the color like

Label1.BackColor= Color.FromArgb (255, green, blue, red);

If you have to change the backcolor of your form, don't use the classname of your form use this.Backcolor instead

Do let us know if it solves your problem and do accept the correct answer to close the thread.
+2
Muhammad Nadeem10y ago
down vote
In WinForms and WebForms you can do:
txtName.BackColor = Color.Aqua;
TextBox.Background = System.Drawing.Color.Red;
I hope this is helpful to you.
+1
Munesh Sharma10y ago
https://www.dotnetperls.com/console-color
-1
Joe Wilson10y ago
Thank you for your answers, this is the code below:
private void Red_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor= Color.FromArgb(red, green, blue);
Message.ForeColor = Color.FromArgb(red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor= bgColor;
}
private void Blue_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor = Color.FromArgb(red, green, blue);
Message.ForeColor = Color.FromArgb(red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor = bgColor;
}
private void Green_TextChanged(object sender, EventArgs e)
{
int red, green, blue = 0;
if (Red.Text == string.Empty) red = 0; else red = Int32.Parse(Red.Text);
if (Green.Text == string.Empty) green = 0; else green = Int32.Parse(Green.Text);
if (Blue.Text == string.Empty) blue = 0; else blue = Int32.Parse(Blue.Text);
System.Drawing.Color fontColor = Color.FromArgb(red, green, blue);
Message.ForeColor = Color.FromArgb(red, green, blue);
System.Drawing.Color bgColor = Color.FromArgb(fontColor.ToArgb() ^ 0xffffff);
this.BackColor = bgColor;
}
green,blue and red are 3 text boxes with respective names and there is a 4th text box named 'randomText' which contains some particular text whose color should change based on other 3 text boxes .

If(green.Text != "0" && blue.Text=="0" && red.Text=="0")
{
randomText.ForeColor=Color.Green; //make sure you have System.Drawing assembly reference
Form1.BackColor=Color.Red; // Form1 is your form's name
}
The problem is this:
the codes which I mentioned by red gives me errors and I don't know how to solve them.
0
Bikesh Srivastava10y ago
I understand your question but i think its not easy to resolve without code ,
can you share code.
-1
Midhun Tp10y ago
Hi,

Please go through below article-
http://www.codeproject.com/Articles/16565/Determining-Ideal-Text-Color-Based-on-Specified-Ba
-1
Joe Wilson10y ago
Thank you for your answer, but it doesn't help me. I want to implement program which the back color and a text box color get inversion.
0
Pradeep Shet10y ago
HI Joe,
Check the below link
https://www.dotnetperls.com/color
-1