How to get root directory information of the specified path in ASP.NET

Path class

Suppose you have a specified path such as "C:/my files/abc.txt" and you want to access root of the specified path (Root is "C:/"). If your path does not contain root directory information then your path class method returns null value or empty string. For accessing root information use GetPathRoot( ) method of the  Path class which is stored in System.IO namespace.

 Lets take an example 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication2
{
    public partial class Form6 : Form
    {
        public Form6()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string path = textBox1.Text;
            string getroot = Path.GetPathRoot(path);
            label2.Text = "Your root directory is "+getroot;


        }
    }
}

.    Output

How to Bind ListView with string List: WPF

As we all know the listview is inherited class of listbox and have almost all the properties of listbox. We have learnt listbox binding with string list in our earlier post. In this article we bind the listview with the same string list.

Just place a listview having only name property, because we have to access that listview in our code behind file. We can also use height and width property of the listview, if the data items are of lengthy string.

<ListView>
<ListView.Name>listView</ListView.Name>
</ListView>

Now use the same list of string as in previous post i.e.

List<string> strList = new List<string>();
strList.Add("London");
strList.Add("Italy");
strList.Add("California");
strList.Add("France");
listView.ItemsSource = strList;

Now look out the last statement, it will set the item source of the listview as this string list. When we run the project it will show a listview with four items:

To get selected item the same procedure will follow as in listview bind with grid resource.

How to use Image in Button: WPF

Most often a button control is used with the content property and sometimes with an image in our programming fields. We have learnt about the content property of the button, now in this article we will place an image in a button control.

To place an image we have to sure first, that the image is in our project’s directory. Now write the following code in XAML just below the grid node (default placed node in a file).

<Grid>
<Button Width="200" Height="50">
<Button.Background>
<ImageBrush ImageSource="buttonImage.png"></ImageBrush>
</Button.Background>
</Button>
</Grid>

In the above code I have set the image named buttonImage.png as the background of the button. It will place a button with an image as in the following image.

As we can see the image has been stretched in the button. To place the image as is, the following code will help you:

<Button Width="200" Height="50">
<Button.ContentTemplate>
<DataTemplate>
<Image Source="buttonImage.png"></Image>
</DataTemplate>              
</Button.ContentTemplate>          
</Button>

Run the project now and the image is placed as it is, the remaining space will be left blank.

How to bind GridView using XML file in ASP.NET

Introduction about XML

XML stands for xtensible markup language. It have many features such as:

• Xml is used for carry data .
• Xml structure is based on tree structure.
• Xml is not a presentation language 
• XML use user defined tags for making structre.
• Xml language is a case-sensitive language. 
• XML is a Text File 

Now at a time if you want to make a structural database in xml file then you follow some steps . these steps are:

Step-1: First defined root node like <bookstore> 

Step-2: Declare child node <bookstore> <book>

Now you can consider book tag is your table name which you create in SQL and bookstore represent the database name.

Step-3 : Declare your column name inside the <book> tag such as Title of the book, author and price of the book .

now your file look like that.

Step-4 repeat your step 2-3 again

Now your complete code is

<?xml version="1.0" encoding="utf-8" ?>
<bookstore>
  <book>
    <title>
      ASP.NET
    </title>
    <author>
      SCOTT
    </author>
    <price>
      20$
    </price>
  </book>
<book>
    <title>
      PHP
    </title>
    <author>
      JECOB
    </author>
    <price>
      20$
    </price>
  </book>


</bookstore>

Dataset

Dataset is a collection of data-Table. So easily you can bind any control with Dataset . Dataset is a class file which stored in System.Data namespace. Here in this example using Dataset we can read xml file from the source. 

lets take an example , How to bind GridView using XML file in ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default12.aspx.cs" Inherits="Default12" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>
    </div>
    </form>
</body>
</html>

Codebehind

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

public partial class Default12 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        DataSet ds = new DataSet();

        ds.ReadXml(Server.MapPath("XMLFile.xml"));

        GridView1.DataSource = ds;

        GridView1.DataBind();

    }

}

Output

How to Bind Gridview using Dictionary DataSource in ASP.NET

Introduction about Dictionary

If you know about array , array can store only single value or single type value  in the memory . It can't store double value in single memory location with different types. Suppose you want to store name and age of the person in single memory location then you must use collection . Here in this example we will use Dictionary collection.
The simple syntax of dictionary object are

Dictionary<type, type> dict =  new Dictionary<type, type>(); 
The above mention syntax is says to you that if you want to store person age with person name then you must use Dictionary
for example 



//create instance of the the Dictionary 
Dictionary<string,int> dict =new Dictionary<string,int>();

//Add item to the dictionary
dict.Add("my name is jacob", 26);
dict.Add("my name is lefore",27);

Now if you want to show of the data , You can use any data control such as GridView , FormView , ListView etc.

Lets take an simple example to bind GridView using Dictionary collection

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default11.aspx.cs" Inherits="Default11" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
        <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView>
 
    </div>
    </form>
</body>
</html>

CodeBehind

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Default11 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        Dictionary<string, int> dict = new Dictionary<string, int>();

        dict.Add("My name is jacob", 26);

        dict.Add("My name is lefore", 27);

        dict.Add("My name is michel", 24);

        dict.Add("My name is lisa", 19);

        GridView1.DataSource = dict;

        GridView1.DataBind();

    }

}

Output

Download Source Code

How to sort Gridview Data in ASP.NET

About Sorting 

Sorting means rearranging data either ascending or descending data. you want to perform sorting of the data then you should apply technique to sort of the data . Various techniques are available in logic programming such as Bubble sort, insertion sort , quick sort , selection sort etc.

Basically GridView represents Data in 2D array. Graphical representation of 2D array is

Lets take an example , Firstly bind GridvView with database using the SqlDataSource. After binding the GridView you should select Enable Sorting Checkbox using ShowSmart Tag.

Your complete Code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default10.aspx.cs" Inherits="Default10" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
        <asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" InsertVisible="False" ReadOnly="True" SortExpression="Id" />
                <asp:BoundField DataField="namet" HeaderText="namet" SortExpression="namet" />
                <asp:BoundField DataField="Income" HeaderText="Income" SortExpression="Income" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM [footerex]"></asp:SqlDataSource>
 
    </div>
    </form>
</body>
</html>

Output

Bind ListView Control with Grid Resource: WPF

Grid resource provides a way to reuse the objects and values by other controllers, as we studied in previous posts. In this article we will bind the listview with Grid resource defined in XAML code:

<Grid.Resources>          
<x:ArrayExtension Type="{ x:Type sys:String}" x:Key="placesSource">
<sys:String>London</sys:String>
<sys:String>Italy</sys:String>
<sys:String>California</sys:String>
<sys:String>France</sys:String>
</x:ArrayExtension>
</Grid.Resources>

This resource is the same in our recent article about listbox binding with grid resource. Write the following code in XAML to bind the above resource:

<ListView Name="listView" ItemsSource="{StaticResource placesSource}">
</ListView>

When we run this project then it will bind the above data with listview as shown in following image:

To get selected item from this listview, write following code in the selectionChanged event of the listview:

private void listView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
string selectedValue = listView.SelectedItem.ToString();
MessageBox.Show(selectedValue);
}

Run the code and change the selection, a message box will display with the selected value.