c# - How to get difference between two arrays

Array difference
array-difference.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>  
  
<!DOCTYPE html>  
<script runat="server">  
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        string[] colors = new string[]
        {
            "red",
            "green",
            "yellow",
            "violet",
        };

        string[] morecolors = {"red","green","pink" };

        StringBuilder morecolorsarraynotexists = new StringBuilder();
        StringBuilder commoncolors = new StringBuilder();

        Label1.Text = "colors array.........<br />";
        foreach (string s in colors)
        {
            Label1.Text += s + "<br />";
            if (!morecolors.Contains(s))
            {
                morecolorsarraynotexists.AppendFormat("{0} ", s);
            }
            else
            {
                commoncolors.AppendFormat("{0} ", s);
            }
        }

        StringBuilder colorsarraynotexists = new StringBuilder();

        Label1.Text += "<br />more colors array.........<br />";
        foreach (string s in morecolors)
        {
            Label1.Text += s + "<br />";
            if (!colors.Contains(s))
            {
                colorsarraynotexists.AppendFormat("{0} ", s);
            }
        }

        Label1.Text += "<br >" + morecolorsarraynotexists + "is not exists in morecolors array<br />";
        Label1.Text += colorsarraynotexists + "is not exists in colors array<br />";
        Label1.Text += commoncolors + "is common colors in both array<br />";
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - array difference</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:DarkBlue; font-style:italic;">  
            c# example - array difference
        </h2>  
        <hr width="550" align="left" color="LightBlue" />    
  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Size="Large"  
            >  
        </asp:Label>  
        <br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="get array difference"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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