Open new project and create a Form1 with one button having text property click

to change color as shown below.

Place a code on the double click on the button event.

publicpartialclasscolor : Form
    {
        Boolean check =  false;//declare check for conditions
        public color()
         {
            InitializeComponent();
         }
  
        privatevoid BtnColour_Click(object sender, EventArgs e)
         {
            if (check ==  false)//checking conditions if check is false
//then executes this statement.
            {
                this.BackColor = Color.Red;//color of the form is red.
                BtnColour.Text = "new window";//resetting button text
                check = true;
            }
            else
            {
                Form1 fm =  newForm1();//create object of the form as fm
                fm.ShowDialog();
  
             }

Next create another page with the help of add existing item,as shown below:

   As soon as we click on the button(…)we can see a colour dialog box as shown

below.

        FIG 1

As soon as we select color in the colordialogbox it will come in the textbox.

Now place a piece of code on the button (…) as below.

  
privatevoid btncolor_Click(object sender, EventArgs e)
         {
            colorDialog1.ShowDialog();//dialogbox will appear.
            textBox1.BackColor = colorDialog1.Color;//in textbox1backcolour filled with the help of colour dialog box as shown in above figure.           
         }
 

Similarly for the second color dialog button (…)

privatevoid button1_Click(object sender, EventArgs e)
         {
            colorDialog2.ShowDialog();
            txtBrowser2.BackColor = colorDialog2.Color;
        }

The output will be appear like

As soon as we click color with the help of color dialog box we will see particular color in the textbox. As shown below in the snapshot.