How to call a function only first time if a button is clicked

A very universal method is offered by my article: Wish You Were Here… Only Once[^].

The usage is unusually simple and looks like this:

if (FirstTime.Here)
    ThisWillHappenButOnlyOnce();

where FirstTime.Here is the static method of my class and ThisWillHappenButOnlyOnce is your method (or anything, some block) you want to call only once per you runtime.

Warning! Implementation of this feature has good performance, very reliable and universal but… understanding of how it works can be a mind-bending. :-)
Please try.

You can use my library in any type of .NET project written in any language.

—SA

Hi,
it can be done easily using a flag.

int i=0;//it is set in the !ispostback 

protected void Button1_Click(object sender, EventArgs e)
{
if(i=0)
{
function()//call our function
i=1;
}

}

try this.if nay doubt pls comment on this.

use a public bool type variable and check it on button click event.like

public Form1()
        {
            InitializeComponent();
        }
        bool a = true;
        private void button1_Click(object sender, EventArgs e)
        {
            if (a == true)
            {
                //your code
                a = false;
            }
        }
         function()//your function
         {
         }
     
        }