Get all days and dates of the selected month in VB.NET

Question

1.00/5 (1 vote)

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VB

textbox1.text = 2021 (Now.Year)
Textbox2.text = .. month (select 1-12)

By using Textbox tool, I want to display all dates of the month selected from Textbox2.

Thank you for your support

What I have tried:

example;
If 9(september) is selected in textbox2,

Date,         day of week
2021/9/1,    wed
2021/9/2,    Thur
2021/9/3,    Fri
.
.
.
2021/9/30,   Thur

Posted 31-Aug-21 21:27pm

Andre Thang

Updated 31-Aug-21 21:38pm

Maciej Los

v2

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Comments

Maciej Los 1-Sep-21 3:30am

Where do you want to display all days of month?

Andre Thang 1-Sep-21 3:45am

in Textboxes.

CHill60 1-Sep-21 3:32am

You forgot to include the code that you have tried

Andre Thang 1-Sep-21 3:45am

It is been only two months I started programming. Therefore, I have no idea how to try. Please help me.

2 solutions

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CHill60 · Accepted Answer · 2021-08-31T21:31:00

Solution 1

Use the DateTime.DaysInMonth(Int32, Int32) Method (System) | Microsoft Docs[^] then just loop from day 1 of month x, year y to the number of days in that month.

Remember to validate the input - i.e. Year is an integer, month is an integer between 1 and 12 (or use a slider control instead of a text box)

Posted 31-Aug-21 21:31pm

CHill60

Comments

Andre Thang 1-Sep-21 3:43am

Thank you very much for your comment. Could you give me a sample code for my question?

CHill60 1-Sep-21 4:07am

Sorry. This is obviously homework from your course, so giving you sample code would not really be helping you to learn. Between the two solutions you already have here you know how to find the number of days in a month - so you could use a For...Next Statement[^], Solution 2 shows an alternative method where you can work out the date of the last day of month (the first date in a month is pretty obvious), then just keep adding 1 day to the "current" date until you get to the end of the month ("while" you have not reached the end) see While...End While Statement[^]
You've said that you want these details in TextBoxes - you would need 31 text boxes and a way of referencing them. A better solution would be to have one textbox that can take multiple lines - see VB.Net - TextBox Control[^]
On all these links I have given you there is sample code. You just need to piece the ideas together

Maciej Los · Accepted Answer · 2021-08-31T21:38:00

Solution 2

Take a look at below example:

VB

Dim yr As String = textbox1.text
Dim mt As String = textbox2.text

Dim startDate As DateTime = New Date(Int32.Parse(yr),  Int32.Parse(mt), 1)
Dim endDate As DateTime = startDate.AddMonths(1).AddDays(-1)
Do While startDate <= endDate
	ListBox1.Items.Add(startDate)
	startDate = startDate.AddDays(1)
Loop

Feel freee to improve it to your needs ;)

Posted 31-Aug-21 21:38pm

Maciej Los

Updated 31-Aug-21 21:39pm

v2

Comments

Andre Thang 1-Sep-21 4:07am

Thank you very much. All days in a month are displayed.
How to display day of week(Monday to Sunday) for each month?

CHill60 1-Sep-21 4:09am

I know you have only been coding for 2 weeks but you must learn to do your own research!
vb.net day of week name - Google Search[^]

Maciej Los 1-Sep-21 4:25am

:D