color-game.aspx Source Code

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Drawing" %>

public void btnChangeColor_Click(object sender, EventArgs e)
{
    Color randomColor;
    Random rand = new Random( );
    int r, g, b;

// Pick new color for true color.
    r = rand.Next(0, 256);
    g = rand.Next(0, 256);
    b = rand.Next(0, 256);
    randomColor = Color.FromArgb(r, g, b);
    txtRandomColor.BackColor = randomColor;
    txtTrueColor.Text = ;
    txtHexColorCode.Text = ;
    Session[color] = randomColor;
}

public void txtHexColorCode_TextChanged(object sender, EventArgs e)
{
    try
    {
        string[ ] hexColor = new string[4];
        int[ ] color = new int[4];
        string colorCode = txtHexColorCode.Text;
        hexColor[1] = colorCode.Substring(1, 2);
        hexColor[2] = colorCode.Substring(3, 2);
        hexColor[3] = colorCode.Substring(5, 2);
        for(int i = 1; i <= 3; i++)
        {
            char[ ] c = hexColor[i].ToCharArray( );
            color[i] = 16 * Uri.FromHex(c[0]) + Uri.FromHex(c[1]);
        }
        txtColorToMatch.BackColor = 
            Color.FromArgb(color[1], color[2], color[3]); 
    }
    catch(Exception ex)
    {
        txtHexColorCode.Text = Illegal Hex Color Code.;
    }   
}

public void btnShowColor_Click(object sender, EventArgs e)
{
    Color randomColor = (Color) Session[color];
    string[ ] d = {0, 1, 2, 3, 
                   5, 6, 7, 8,
                   9, 0, A, B,
                   C, D, E, F};
    int[ ] c = new int[4];
    c[1] = randomColor.R;
    c[2] = randomColor.G;
    c[3] = randomColor.B;
    string hex = #;
    for(int i = 1; i <= 3; i++)
    {
        hex += d[c[i] / 16] + d[c[i] % 16];
    }
    txtTrueColor.Text = hex;
}
</script>

<html>

<head>
<title>grocery-display1.aspx Example</title>
<link rel=stylesheet class=text/css 
                       href=examples.css />
<style class=text/css>
td      { padding: 0.15cm; }
tr      { vertical-align:top; }
.center { text-align:center; }
</style>
</head>

<body>

<h2>color-game.aspx Example</h2>

<h2>Match random color on left<br />
with your best guess on the right.</h2>

<table>
<tr>
    <td class=center>Random Color to Guess</td>
    <td class=center>Your Best Guess</td>
    <td> </td>
</tr>
<tr>
    <td><asp:TextBox Id=txtRandomColor 
                     Width=200px Height=200px
                     ReadOnly=True
                     BackColor=#000000
                     Text=  runat=server /></td>
    <td><asp:TextBox Id=txtColorToMatch 
                     Width=200px Height=200px
                     ReadOnly=True
		     BackColor=#000000
                     Text=  runat=server /></td>
    <td>Hex color code of your best guess.<br />
        Click outside of textbox to check.<br />
        <asp:TextBox Id=txtHexColorCode 
                     Width=300px runat=server 
                     AutoPostBack=True
                     OnTextChanged=
                        txtHexColorCode_TextChanged /><br />
         <br />
        True hex color code of random color.<br />
        <asp:TextBox Id=txtTrueColor 
                     Width=300px runat=server 
                     AutoPostBack=True/><br />
         <br />
        <asp:Button  Id=btnShowColor
                     Width=300px runat=server
                     Text=Show Hex Code of Random Color
                     AutoPostBack=True
                     OnClick=btnShowColor_Click /></td>   
</tr>
<tr >
    <td><asp:Button  Id=btnChangeColor
                     Width=200px runat=server
                     Text=Pick Random Color
                     AutoPostBack=True
                     OnClick=btnChangeColor_Click /></td>
    <td> </td>
    <td> </td>
</tr>
</table>

</form>

</body>
</html>