date in web service

[barmatt80]

I have a webservice that accepts a date which ultimately submits to a sql server 2008 database with a data type of date (allows null values), however the infopath form that submits that date sometimes might be blank or null.

I can't figure out how to check if the date variable the web service is accepting (datStartDate) is blank or null from the form, and if null/blank then submit a Null value to the database, if not null send the date the form is sending.

I have tried Nullable(Of Date) check on that variable and also hasvalue but can't get it to work.

thanks for you help

this is hte code i am currently using and works great if i actually submit a value

<WebMethod(Description:="")> _
    Public Function SubmitAppData(ByVal strAppID As String, ByVal datStartDate As Date) As Integer
 
        Dim sqlCon As New SqlConnection()
        Dim sqlCmd As New SqlCommand()
 
 
        'sqlCon.ConnectionString = "connection string info"
        sqlCon.ConnectionString = connStr
 
        If sqlCon.State = ConnectionState.Closed Then
            sqlCon.Open()
        End If
        sqlCmd.CommandText = "usp_SendValues"
        sqlCmd.Connection = sqlCon
        sqlCmd.CommandType = CommandType.StoredProcedure
 
        'Dim maxDate As Nullable(Of Date)
        'maxDate = datDRLastTestDate
 
        Dim Parameter1 As SqlParameter = New SqlParameter("@AppID", strAppID)
        Dim Parameter2 As SqlParameter = New SqlParameter("@StartDate", datStartDate)
 
        Parameter1.Direction = ParameterDirection.Input
        Parameter2.Direction = ParameterDirection.Output
 
        sqlCmd.Parameters.Add(Parameter0)
        sqlCmd.Parameters.Add(Parameter1)
 
 
        Dim dr As SqlDataReader
        dr = sqlCmd.ExecuteReader()
 
        sqlCon.Close()
 
    Dim returnValue as String = "Hello"
 
        Return returnValue
 
    End Function

[Frinavale]

I'm not entirely sure I understand what your problem is exactly...but..

A DateTime is a primitive/value type which means that it always has a value. It can't be null/nothing.

You can check to see if the DateTime contains the same value as a New DateTime to see if "nothing" was supplied. From this you can determine whether you parameter to DBNull.Value (if the user provided nothing) or to the date that the user provided.

-Frinny

[barmatt80]

thanks for the help i got it figured out, i changed it to text and was able to pass the null or date to the web service.