c# - How to get a substring from a string

String Substring() Method
.net String.Substring method allow us to retrieve a substring from a string object. this method have two overloaded method those are Substring(Int32) and Substring(Int32, Int32).

Substring(Int32) overloaded method retrieve a substring from a string by starting at a specified character position and continues to the end of the string. this method need to pass a parameter name startIndex. this parameter data type is System.Int32. startIndex parameter value specify a zero based starting character position of the string. this method does not modify the current string instance, it returns a new string that begins at the startIndex position of the current string.

Substring(Int32, Int32) overloaded method allow us to get a substring from a string that start a specified character position of string and has a specified length. this method have two parameters, those are startIndex and length. startIndex is the zero based starting character position of a substring in this instance. length parameter specify the number of characters in the substring.

the folLowing asp.net c# example code demonstrate us how can we get a substring from a string in .net framework.
Substring.aspx 

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


<!DOCTYPE html>

<script runat="server">
    protected void page_Load(object sender, System.EventArgs e) {
        if(!this.IsPostBack)
        {
            TextBox1.Text = "Jones is here.";
        }
    }
    protected void Button1_Click(object sender, System.EventArgs e) {
        string myString = TextBox1.Text.ToString();
        string subString = myString.Substring(0,5);

        Label1.Text = "Substring[0,5]: " + subString;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to get substring from a string in asp.net</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">asp.net string example: Substring()</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="Firebrick"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="Test String"
             ForeColor="Purple"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server" 
             BackColor="Purple" 
             ForeColor="Snow"
             >
        </asp:TextBox>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Get Substring [0,5]"
             ForeColor="Purple"
             />   
    </div>
    </form>
</body>
</html>
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