多次单击按钮时，C＃更改标签文本

Question

Sorry I am new to this just wondering if someone can help, I am trying to get my label to change its text every time I click the button. Not sure how I should go about it. Can anyone help me please.

private void button1_Click(object sender, EventArgs e)
    {  
        string[] MonthName;
        MonthName = new string[12];

        MonthName[0] = "January";
        MonthName[1] = "February";
        MonthName[2] = "March";
        MonthName[3] = "April";
        MonthName[4] = "May";
        MonthName[5] = "June";
        MonthName[6] = "July";
        MonthName[7] = "August";
        MonthName[8] = "September";
        MonthName[9] = "October";
        MonthName[10] = "November";
        MonthName[11] = "December";


            label1.Text = (MonthName[0]);
            label1.Text = (MonthName[1]);   

Answer 1

Might be easier to do it this way:

DateTime currentDate = new DateTime(DateTime.Now.Year, 1, 1); // Per Habib's suggestion

private void button1_Click(object sender, EventArgs e) {
    label1.Text = currentDate.ToString("MMMM");
    currentDate = currentDate.AddMonths(1);
}

Answer 2

This should do the trick:

Declare the array and an int in the class

string[] MonthName = { "Jan", "Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec" };
    static int i = 0;

Then in the button click

protected void btnAddMonth_Click(object sender, EventArgs e)
{
    lblMonth.Text = MonthName[i];
    i = (i+1) % 12;
}

Answer 3

1. Move the array initialization outside the click handler.
2. Have a hidden label that stores the counter to determine which element in the array to pick.

Something like the below code. Please mind that this is not the most elegant code, but I wanted to keep it simple as you said you are new to this.

var Months = new List<string>
            {
                   "January",
                   "February",
                   "March",
                   "April",
                   "May",
                   "July",
                   "August",
                   "September",
                   "October",
                   "November",
                   "December"
            };

private void button1_Click(object sender, EventArgs e)
{
        if(string.IsNullOrEmpty(labelHiddenCounter.Text))
            labelHiddenCounter.Text = "0";

        if(labelHiddenCounter.Text == "11")
            labelHiddenCounter.Text = "-1";

        var nextCounter = Convert.ToInt32(labelHiddenCounter.Text) + 1;

        label1.Text = (Months[nextCounter]);

        labelHiddenCounter.Text = nextCounter.ToString();
}

Answer 4

If you want random months to appear whenever you click the button use.

        var random = new Random();
        var months = new List<string>
        {
             "Jan", 
             "Feb", 
             "Mar", 
             "Apr", 
             "May", 
             "Jun", 
             "Jul", 
             "Aug", 
             "Sep", 
             "Oct", 
             "Nov", 
             "Dec"
        };

        int index = random.Next(months.Count);
        label1.Text = (months[index]);