c# - How to convert a string to lowercase characters

String ToLower() Method
String ToLower() method return a copy of the specified string converted to lowercase. this string method exists in the System namesapce. the ToLower() method return value type is System.String which is a lowercase string. this method does not modify the provided string instance, it just return a new instance of string object in which all characters are lowercase. this ToLower() method return a new string by converting all the characters to lowercase from provided string.

the ToLower() method have an overload method that is ToLower(CultureInfo). this ToLower(CultureInfo) method return a copy of the specified string converted to lowercase, using the casing rules of the specified culture.

the following .net c# example code demonstrate us how can we convert a string to lowercase characters in an asp.net application.
ToLower.aspx 

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

<!DOCTYPE html>

<script runat="server">
    protected void page_Load(object sender, System.EventArgs e) {
        if(!this.IsPostBack)
        {
            TextBox1.Text = "CLICk BUTTON FOR Convert string to Lowercase.";
            TextBox1.Width = 350;
        }
    }
    protected void Button1_Click(object sender, System.EventArgs e) {
        string myString = TextBox1.Text.ToString();
        string modifiedString = myString.ToLower();

        Label1.Text = "String converted successfully to lower case!";
        TextBox1.Text = modifiedString;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to convert (change) a string to lowercase characters in asp.net</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">asp.net string example: ToLower()</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="HotPink"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="Test String"
             ForeColor="Green"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server" 
             BackColor="DarkGreen" 
             ForeColor="SpringGreen"
             >
        </asp:TextBox>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Change String To Lowercase"
             ForeColor="Green"
             />   
    </div>
    </form>
</body>
</html>
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