c# - How to format a string with leading zeros

String format leading zeros
string-format-leading-zeros.aspx

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

<!DOCTYPE html>  
<script runat="server"> 
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        //this line create a string variable.
        string stringValue = "asp.net examples";

        //this line create an integer variable.
        int intValue = 12345;

        Label1.Text = "string value: " + stringValue.ToString();
        Label1.Text += "<br />integer value: " + intValue.ToString();

        //string format left padding and right padding
        Label1.Text += "<br /><br />string format left padding with 0: " + stringValue.ToString().PadLeft(stringValue.Length + 1, '0');
        Label1.Text += "<br />string format left padding with 3 zeros: " + stringValue.ToString().PadLeft(stringValue.Length + 3, '0');

        Label1.Text += "<br /><br />string format number to leading 2 zeros: " + intValue.ToString().PadLeft(intValue.ToString().Length + 2, '0');
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - string format leading zeros</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:MidnightBlue; font-style:italic;">  
            c# example - string format leading zeros
        </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 format leading zeros"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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