c# - How to get number of characters from left side of a string

String left
string-left.aspx

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

<!DOCTYPE html>  
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        //this section create a string variable.
        string plants = "Buffalo Weed. Buckeye. Blackhaw. False Boxwood";

        Label1.Text = "string of plants..................<br />";
        Label1.Text += plants + "<br />";

        //this line get left most 7 letters from string
        string leftSubString = plants.Substring(0, 7);

        string left13Characters = plants.Substring(0, 13);

        Label1.Text += "<br />left most 7 characters from plants string........<br />";
        Label1.Text += leftSubString;

        Label1.Text += "<br /><br />left most 13 characters from plants string........<br />";
        Label1.Text += left13Characters;
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - string left</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:MidnightBlue; font-style:italic;">  
            c# example - string left
        </h2>  
        <hr width="550" align="left" color="Gainsboro" />  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Size="Large"
            >  
        </asp:Label>  
        <br /><br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="string left"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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