Substring() Example Syntax VB.NET ASP.NET | Substring() | Source Code
Posted by asp.net videos on Sunday, March 6, 2011 · Leave a Comment
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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 | |
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> | | | |
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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