Question

I have 2 textboxes, txtStartDate.Text and txtEndDate.Text, user choose date through calendar date picker.
Now I want to count the days between the two selected date and save the result in the database field totalDay(type integer), the following is my code:

But when I click button and try to save it into database, i receive this error:

The version of SQL Server in use does not support datatype ‘time’.

What should I do to overcome this problem?

Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Threading
Imports System.Globalization

Partial Class addevent
Inherits System.Web.UI.Page

Protected Sub ButtonAddEvent_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonAddEvent.Click

    Dim connString As String = ConfigurationManager.ConnectionStrings("ConnectionString1").ConnectionString
    '"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\eventdb.mdf;Integrated Security=True;User Instance=True"
    Dim con As SqlConnection = New SqlConnection(connString)

    Dim cmdQuery As String = "INSERT INTO eventinfo(venue,totalDay,eventTitle,startDate,endDate,description) VALUES (@venue,@totalDay,@eventTitle,@startDate,@endDate,@description)"
    Dim cmd = New SqlCommand(cmdQuery)
    cmd.Connection = con
    cmd.CommandType = CommandType.Text
    con.Open()
    cmd.Parameters.AddWithValue("@eventTitle", txtEventTitle.Text)
    cmd.Parameters.AddWithValue("@venue", txtEventLocation.Text)
    cmd.Parameters.AddWithValue("@startDate", txtStartDate.Text)
    cmd.Parameters.AddWithValue("@endDate", txtEndDate.Text)
    cmd.Parameters.AddWithValue("@description", txtEventDescription.Text)

    Dim fmt As String = "dd/MM/yyyy"
    Dim dtStart As DateTime = DateTime.ParseExact(txtStartDate.Text, fmt, Nothing)
    Dim dtEnd As DateTime = DateTime.ParseExact(txtEndDate.Text, fmt, Nothing)

    Dim ts As TimeSpan = dtEnd - dtStart

    cmd.Parameters.AddWithValue("@totalDay", ts.TotalDays)


    cmd.ExecuteNonQuery()
    cmd.Parameters.Clear()
    con.Close()

    Response.Redirect("~/addbooth.aspx")

End Sub
End Class

My table structure:

Answer 1

As your field is of type integer, and you only let users input days without a time component, the following could work:

cmd.Parameters.AddWithValue("@totalDay", ts.Days)

TimeSpan.TotalDays gives you days and fractions of days as a double, TimeSpan.Days only the whole days.