using System;
using System.Data;
using System.Windows.Forms;
using System.Xml;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
XmlTextWriter writer = new XmlTextWriter("product.xml", System.Text.Encoding.UTF8);
writer.WriteStartDocument(true);
writer.Formatting = Formatting.Indented;
writer.Indentation = 2;
writer.WriteStartElement("Table");
createNode("1", "Product 1", "1000", writer);
createNode("2", "Product 2", "2000", writer);
createNode("3", "Product 3", "3000", writer);
createNode("4", "Product 4", "4000", writer);
writer.WriteEndElement();
writer.WriteEndDocument();
writer.Close();
MessageBox.Show("XML File created ! ");
}
private void createNode(string pID, string pName, string pPrice, XmlTextWriter writer)
{
writer.WriteStartElement("Product");
writer.WriteStartElement("Product_id");
writer.WriteString(pID);
writer.WriteEndElement();
writer.WriteStartElement("Product_name");
writer.WriteString(pName);
writer.WriteEndElement();
writer.WriteStartElement("Product_price");
writer.WriteString(pPrice);
writer.WriteEndElement();
writer.WriteEndElement();
}
}
}
Tuesday, February 28, 2017
How to create an XML file in C#
How to use C# Directory Class
using System;
using System.Windows.Forms;
using System.IO;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (Directory.Exists("c:\\testDir1"))
{
//shows message if testdir1 exist
MessageBox.Show ("Directory 'testDir' Exist ");
}
else
{
//create the directory testDir1
Directory.CreateDirectory("c:\\testDir1");
MessageBox.Show("testDir1 created ! ");
//create the directory testDir2
Directory.CreateDirectory("c:\\testDir1\\testDir2");
MessageBox.Show("testDir2 created ! ");
//move the directory testDir2 as testDir in c:\
Directory.Move("c:\\testDir1\\testDir2", "c:\\testDir");
MessageBox.Show("testDir2 moved ");
//delete the directory testDir1
Directory.Delete("c:\\testDir1");
MessageBox.Show("testDir1 deleted ");
}
}
}
}
How to C# String Null
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str =null;
if (str == null)
{
MessageBox.Show("String is null");
}
else
{
MessageBox.Show("String is not null");
}
str = "test";
if (string.IsNullOrEmpty(str))
{
MessageBox.Show("String is empty or null");
}
else
{
MessageBox.Show("String is not empty or null");
}
}
}
}
How to use C# string Copy
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str1 = null;
string str2 = null;
str1 = "CSharp Copy() test";
str2 = string.Copy(str1);
MessageBox.Show(str2);
}
}
}
When you run this C# source code you will get same content of str1 in str2
How to use C# string Equals
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str1 = "Equals";
string str2 = "Equals";
if (string.Equals(str1, str2))
{
MessageBox.Show("Strings are Equal() ");
}
else
{
MessageBox.Show("Strings are not Equal() ");
}
}
}
}
When you run this C# program you will get message "Strings are Equal() "
How to use C# string Insert
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = "This is CSharp Test";
string insStr = "Insert ";
string strRes = str.Insert(15, insStr);
MessageBox.Show(strRes);
}
}
}
When you execute this C# program you will get the message box
showing "This is CSharp Insert Test"
How to use C# string Contains
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = null;
str = "CSharp TOP 10 BOOKS";
if (str.Contains("TOP") == true)
{
MessageBox.Show("The string Contains() 'TOP' ");
}
else
{
MessageBox.Show("The String does not Contains() 'TOP'");
}
}
}
}
When you run the C# program you will get the MessageBox with message
"The string Contains() 'TOP' "
How to use C# string Compare
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str1 = null;
string str2 = null;
str1 = "csharp";
str2 = "CSharp";
int result = 0;
result = string.Compare(str1, str2);
MessageBox.Show(result.ToString());
result = string.Compare(str1, str2, true);
MessageBox.Show(result.ToString());
}
}
}
When you run this C# program first u will get -1 in message box and then 0
How to use C# string IndexOf
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = null;
str = "CSharp TOP 10 BOOKS";
MessageBox.Show(str.IndexOf("BOOKS").ToString());
}
}
}
When you execute this C# program you will get the number 14 in the message box.
That means the substring "BOOKS" occurred and start in the position 14.
Monday, February 27, 2017
How to validate a string in C#
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
bool isNumeric;
int i;
string str = "100";
isNumeric = int.TryParse(str, out i);
MessageBox.Show("The value of i is " + i);
}
}
}
How to use C# string Format
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
double dNum = 0;
dNum = 32.123456789;
MessageBox.Show("Formated String " + string.Format("{0:n4}", dNum));
}
}
}
When you run this C# source code you will get "Formated String 32.1234"
How to use C# string Length
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = null;
str = "This is a Test";
MessageBox.Show(str.Length.ToString());
}
}
}
When you execute this C# source code you will get 14 in the messagebox.
How to use C# string Clone
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
{
string str = "Clone() Test";
string clonedString = null;
clonedString = (String)str.Clone();
MessageBox.Show (clonedString);
}
}
}
}
When you run this C# program you will get the same content of the
first string "Clone() Test"
How to use C# string Concat
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str1 = null;
string str2 = null;
str1 = "Concat() ";
str2 = "Test";
MessageBox.Show(string.Concat(str1, str2));
}
}
}
When you run this C# source code you will get "Concat() Test " in message box.
How to use C# string Split
C Sharp Hello Word
using System;
namespace HelloWorld
{
class Hello
{
public static void Main(String[] args)
{
Console.WriteLine("Hello World");
}
}
}
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