c# winforms - how to populate DataGridViewRowHeaders and FirstRow - like a Calendar

Question

On a form I have a DataGridView and three buttons.

Buttons are: lastMonth, currentMonth and nextMonth.

dgv has 30 or 31 columns (each column is a day of the month).

ColumnHeaders are: 1 2 3 ... (date).

I should populate firstRow of dgv with the dayNames (first letter) - M T V ...

something like:

1 2 3 4 5... till 30 or 31 // these are column headers

M T W T F... till end // these are firstRowCells

Click on Buttons should change the first row according to first letter of the day in corresponding month.

Anu idea about coding ? Thanks.

Vulpes · Answer

Try something like the following: public partial class Form1 : Form { private int displayedYear; private int displayedMonth; public Form1() { InitializeComponent(); } private void Form1_Load(object sender EventArgs e) { dataGridView1.ColumnCount = 31; dataGridView1.RowCount = 1; // first 28 days will be displayed whatever the month for (int i = 0; i // show current month initially currentMonth.PerformClick(); } private void SetFinalDays(int daysInMonth) { switch (daysInMonth) { case 28: dataGridView1.Columns[28].HeaderText = ; dataGridView1.Columns[29].HeaderText = ; dataGridView1.Columns[30].HeaderText = ; return; case 29: dataGridView1.Columns[28].HeaderText = 29; dataGridView1.Columns[29].HeaderText = ; dataGridView1.Columns[30].HeaderText = ; return; case 30: dataGridView1.Columns[28].HeaderText = 29; dataGridView1.Columns[29].HeaderText = 30; dataGridView1.Columns[30].HeaderText = ; return; case 31: dataGridView1.Columns[28].HeaderText = 29; dataGridView1.Columns[29].HeaderText = 30; dataGridView1.Columns[30].HeaderText = 31; return; } } private void DisplayDays() { DateTime dt = new DateTime(displayedYear displayedMonth 1); label1.Text = dt.ToString(MMMM yyyy); // show month DGV is displaying in label say int daysInMonth = DateTime.DaysInMonth(dt.Year dt.Month); SetFinalDays(daysInMonth); for (int i = 0; i { dataGridView1.Rows[0].Cells[i].Value = dt.DayOfWeek.ToString().Substring(0 1); dt = dt.AddDays(1); } for (int i = daysInMonth; i } private void currentMonth_Click(object sender EventArgs e) { displayedMonth = DateTime.Today.Month; displayedYear = DateTime.Today.Year; DisplayDays(); } private void lastmonth_Click(object sender EventArgs e) { int month = displayedMonth - 1; if (month == 0) { displayedMonth = 12; displayedYear--; } else { displayedMonth--; } DisplayDays(); } private void nextMonth_Click(object sender EventArgs e) { int month = displayedMonth + 1; if (month == 13) { displayedMonth = 1; displayedYear++; } else { displayedMonth++; } DisplayDays(); } }

Memento · Answer

for (int i = 1; i { MessageBox.Show(Vulpes youAreFantastic!); } itWorks.