c# - How to count occurrences of a string within a string

Count occurrences of a string within a string
count-occurrences-of-a-string-within-a-string.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>

<!DOCTYPE html>
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Label1.Text = "";
        string text = "this| is| a| sample text";
        int count = text.Split('|').Length-1;
        Label1.Text += text + " / " + count; 
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>c# example - count occurrences of a string within a string</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            c# example - count occurrences of
            <br /> a string within a string
        </h2>
        <hr width="550" align="left" color="LightBlue" />  

        <asp:Label 
            ID="Label1" 
            runat="server"
            Font-Size="XX-Large"
            >
        </asp:Label>
        <br /><br />
        <asp:Button 
            ID="Button1" 
            runat="server" 
            Text="Count Occurrences Of A String Within A String" 
            OnClick="Button1_Click"
            Height="40"
            Font-Bold="true"
            />
    </div>
    </form>
</body>
</html>
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