c# - How to merge two arrays without duplicates

Array merge without duplicates
linq-union-array-merge-without-duplicates.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>  
  
<!DOCTYPE html>  
<script runat="server">  
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        string[] colors = { "red", "blue", "green" };
        string[] colors2 = { "crimson", "green", "hotpink"};
        var mergedcolors = colors.Union(colors2);

        Label1.Text = "Colors: ";
        foreach(string s in colors)
        {
            Label1.Text += s + " | ";
        }
        Label1.Text += "<br />Colors2: ";
        foreach(string s in colors2)
        {
            Label1.Text += s + " | ";
        }
        Label1.Text += "<br />Merged Colors: ";
        foreach (string s in mergedcolors)
        {
            Label1.Text += s + " | ";
        }
     }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# linq union example - array merge without duplicates</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:DarkBlue; font-style:italic;">  
            c# linq union example - array merge without duplicates
        </h2>  
        <hr width="550" align="left" color="LightBlue" />    
  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Size="Large"  
            >  
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        <br /><br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="array merge without duplicates"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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