با استفاده از این کد
int YearTemp = int.Parse(textBox1.Text);
int BetweenYear = 0;
int IDYearFirstDay = 0;
if(YearTemp <= 1999 && YearTemp >= 1300)
{
BetweenYear = YearTemp - 1300;
}
else if (YearTemp >= 2000 && YearTemp <= 1299)
{
return;
}
if(BetweenYear <= 3)
{
IDYearFirstDay = BetweenYear + 2;
}
else if(BetweenYear > 3)
{
int CountKabise = (BetweenYear / 4);
int CounterForFirstDayOfYear = CountKabise + BetweenYear + 2;
if(CounterForFirstDayOfYear >= 7)
{
CounterForFirstDayOfYear = CounterForFirstDayOfYear % 7;
}
IDYearFirstDay = CounterForFirstDayOfYear;
}
if(IDYearFirstDay == 0)
{
textBox2.Text = "شنبه";
}
else if(IDYearFirstDay == 1)
{
textBox2.Text = "یکشنبه";
}
else if(IDYearFirstDay == 2)
{
textBox2.Text = "دوشنبه";
}
else if(IDYearFirstDay == 3)
{
textBox2.Text = "سه شنبه";
}
else if(IDYearFirstDay == 4)
{
textBox2.Text = "چهار شنبه";
}
else if(IDYearFirstDay == 5)
{
textBox2.Text = "پنجشنبه";
}
else if(IDYearFirstDay == 6)
{
textBox2.Text = "جمعه";
}