public int getDaysInMonth(int strMonth，int strYear)
{
int strDays = 0；
Switch (strMonth)
{
Case 1:
Case 3:
Case 5:
Case 7:
Case 10:
Case 12:
strDays = 3 1； Break;
Case 4:
Case 6:
Case 9:
Case 1 1:
StrDays = 30 broken;
Case 2:
if((strYear % 4 = = 0 & amp； & ampstrYear % 100！ = 0) || strYear % 400 == 0)
strDays = 29
other
strDays = 28
Break;
}
Return to strDays
}
}
PS: If your strMonth and strYear are strings, you can use int. StrMonth or transformation. ToInt32(strMonth) converts them to Int types.