C#

Christian Graus wrote:

A private constructor and a create method. A static boolean flag that starts as false, is set true by the Create method, and returns null once that flag is true.

public SingletonClass
{
    private static SingletonClass onlyInstance;
 
    // Private constructor - only this class can instantiate itself
    private SingletonClass()
    {
    }
 
    public SingletonClass Instance
    {
        get
        {
            if (onlyInstance == null)
                onlyInstance = new SingletonClass();
            return onlyInstance;
        }
    }
 
    // Do your stuff here.
}

Mr.Prakash wrote:

where is the removed declared?

and how is onlyInstance initialised?

namespace ConsoleApplication1<br />
{<br />
    class TestClass<br />
    {<br />
        // static variable<br />
        public static int instanceCount = 0;<br />
<br />
        // Constructor<br />
        public TestClass()<br />
        {<br />
            instanceCount++;<br />
        }<br />
        // Some code<br />
        // ...<br />
    }<br />
<br />
    class Program<br />
    {<br />
        static void Main(string[] args)<br />
        {<br />
            TestClass myTestClass1 = new TestClass();<br />
            TestClass myTestClass2 = new TestClass();<br />
            Console.WriteLine(TestClass.instanceCount);<br />
            Console.ReadLine();<br />
        }<br />
    }<br />
}<br />

public SingletonClass
{
    private static SingletonClass onlyInstance;
 
    // Private constructor - only this class can instantiate itself
    private SingletonClass()
    {
    }
 
    public SingletonClass Instance
    {
        get
        {
            if (onlyInstance == null)
                onlyInstance = new SingletonClass();
            return onlyInstance;
        }
    }
 
    // Do your stuff here.
}

sachin41406 wrote:

CreateDIBSection

<br />
private void textBox1_TextChanged(object sender, EventArgs e)<br />
{<br />
    toolTip1.SetToolTip(pictureBox1, textBox1.Text);<br />
    //toolTip1.RemoveAll();<br />
}<br />