Substring() Example Syntax VB.NET ASP.NET | Substring() | Source Code
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Substring Example Syntax VB.NET ASP.NET | Substring | Source Code
Summary: – Illustrates using Substring with Source Code Syntax Example in VB.NET ASP.NET.
*** 2. Substring Syntax ***
Purpose:
Returns the string that starts at the specified position and has the specified
length. If the length is not specified, all of the characters to the end are returned.
Syntax:
inputString.Substring(startIndex[, length])
Parameters |
Description |
inputString |
Required – string that you want to get
a part of.
|
startIndex |
Optional. specifies where to start. Zero-based.
|
length |
Optional. specifies how many characters to
to return past start. If no length is specified, rest of string
is returned.
|
Result Data Type |
Description |
string |
Returns the string that starts at the
specified position and has the specified
length. If the length is not specified,
all of the characters to the end are returned.
|
*** 3. Substring – Quick Example ***
|
Dim strSubstringExample As String = “This is a test string”
TextBox1.Text = strSubstringExample.Substring(0,4) ‘Returns This
|
*** 4. Substring – Full Example ***
Substring Example Output Screenshot
Step 1: Click on Visual Basic to Cut-n-paste code into Substring.aspx.vb
Imports System
Imports System.IO
Imports System.Data
' This example is from http://idealprogrammer.com
' It shows how you can use Substring syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose: Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'
' Syntax: inputString.Substring(startIndex[, length])
'
' Parameter1: inputString - Required - string that you want to get
' a part of.
'
' Parameter2: startIndex - Optional. specifies where to start. Zero-based.
'
' Parameter3: length - Optional. specifies how many characters to
' to return past start. If no length is specified, rest of string
' is returned.
'
' Result: string - Returns the string that starts at the
' specified position and has the specified
' length. If the length is not specified,
' all of the characters to the end are returned.
'
' Quick Example: Dim strSubstringExample As String = "This is a test string"
' TextBox1.Text = strSubstringExample.Substring(0,4) 'Returns This
'
'****************************************************************************************
Partial Class _Substring
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label1.Text = "Example #1: Substring(startIndex[, length]) "
Dim strSubstringExample As String = "This is a test string"
Dim intIndexSubstring As Integer = 0
' First find position of word test
intIndexSubstring = strSubstringExample.IndexOf("test")
' Get everything starting at "test" to end of string
TextBox1.Text = strSubstringExample.Substring(intIndexSubstring)
End Sub
End Class |
Imports System
Imports System.IO
Imports System.Data
' This example is from http://idealprogrammer.com
' It shows how you can use Substring syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose: Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'
' Syntax: inputString.Substring(startIndex[, length])
'
' Parameter1: inputString - Required - string that you want to get
' a part of.
'
' Parameter2: startIndex - Optional. specifies where to start. Zero-based.
'
' Parameter3: length - Optional. specifies how many characters to
' to return past start. If no length is specified, rest of string
' is returned.
'
' Result: string - Returns the string that starts at the
' specified position and has the specified
' length. If the length is not specified,
' all of the characters to the end are returned.
'
' Quick Example: Dim strSubstringExample As String = "This is a test string"
' TextBox1.Text = strSubstringExample.Substring(0,4) 'Returns This
'
'****************************************************************************************
Partial Class _Substring
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label1.Text = "Example #1: Substring(startIndex[, length]) "
Dim strSubstringExample As String = "This is a test string"
Dim intIndexSubstring As Integer = 0
' First find position of word test
intIndexSubstring = strSubstringExample.IndexOf("test")
' Get everything starting at "test" to end of string
TextBox1.Text = strSubstringExample.Substring(intIndexSubstring)
End Sub
End Class
Step 2: Click on XML to Cut-n-paste code into Substring.aspx
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Substring.aspx.vb" Inherits="_Substring" %>
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
<h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
<h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
</div>
</form>
</body>
</html> |
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Substring.aspx.vb" Inherits="_Substring" %>
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
<h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
<h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
<asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
</div>
</form>
</body>
</html>
Prerequistes:
- Install Visual Web Developer 2010
- Install SQL Server Express
- Download Northwind and Pubs Databases
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.
Instructions:
- Use Visual Web Developer 2010
- Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select Visual Basic for Language
- name of Web Site could be VBNET_ASPNET_Syntax.
- Add New folder named “StringManipulation”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: StringManipulation
- Add Web Form Named Substring to StringManipulation folder
- Right-click StringManipulation folder;
- add new item;
- Select Web Form
- Check place code behind in separate file
- Web Form name could be Substring
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Substring.aspx.vb
- Click on XML in step 2 above to copy code into web form Substring.aspx
- Right-click on Substring.aspx in solution explorer and select view in browser
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