5th, 10th, nth working (business) day from today (or anydate)

Here is a little piece of code using which you can calculate 5th, 10th or nth (here n can be any number) working (business) day from today (or any given date).
Note that we are assumiung that Saturday and Sunday are weekend, you can change the code if your weekend is not on Saturday, Sunday.
btnCalc is the button on which's click we are calling the function to calculate and lblDate is the label where we are showing the nth working (business) date.

C# (CSharp)

protected void btnCalc_Click(object sender, EventArgs e)

    {

        //Here I am calculating 10th working (business) day from today. You can replace the parameter 10 with your required number of working (business) day

        //Also I am calculating from today, you can give your required Date as parameter as well at the place of DateTime.Now

        lblDate.Text = calculateNthWorkingDay(10, DateTime.Now).ToString();

    }

    public DateTime calculateNthWorkingDay(int n, DateTime pFromDate) //n=Number of working day.

    {

        int mWorkingDays = 0;

        for (int i = 1; i <= n; i++)

        {

            pFromDate = pFromDate.AddDays(1);

            if (!IsWeekEnd(pFromDate))

                mWorkingDays++;

            else

                n++;

        }

        return pFromDate;

    }

    public bool IsWeekEnd(DateTime pDateTime)

    {

        bool isWeekEnd = false;

        if ((pDateTime.DayOfWeek == DayOfWeek.Saturday) || (pDateTime.DayOfWeek == DayOfWeek.Sunday))

        {

            isWeekEnd = true;

        }

        return isWeekEnd;

    }

VB.Net

Protected Sub btnCalc_Click(sender As Object, e As EventArgs)

        'Here I am calculating 10th working (business) day from today. You can replace the parameter 10 with your required number of working (business) day

        'Also I am calculating from today, you can give your required Date as parameter as well at the place of DateTime.Now

        lblDate.Text = calculateNthWorkingDay(10, DateTime.Now).ToString()

    End Sub

    Public Function calculateNthWorkingDay(n As Integer, pFromDate As DateTime) As DateTime

        'n=Number of working day.

        Dim mWorkingDays As Integer = 0

        For i As Integer = 1 To n

            pFromDate = pFromDate.AddDays(1)

            If Not IsWeekEnd(pFromDate) Then

                mWorkingDays += 1

            Else

                n += 1

            End If

        Next

        Return pFromDate

    End Function

    Public Function IsWeekEnd(pDateTime As DateTime) As Boolean

        Dim isWeekEnd As Boolean = False

        If (pDateTime.DayOfWeek = DayOfWeek.Saturday) OrElse (pDateTime.DayOfWeek = DayOfWeek.Sunday) Then

            isWeekEnd1 = True

        End If

        Return isWeekEnd1

    End Function