"Procedure or function expects parameter which was not supplied" - vb.net

Question

I've been trying to figure out this bug for a while now, some help would be appreciated. Thanks.
Here is my error message:
Procedure or function 'getAvailableSMSNumbers' expects parameter '#Election_ID', which was not supplied.
Here is my sql code:
CREATE PROCEDURE {databaseOwner}{objectQualifier}getAvailableSMSNumbers
#Election_ID nvarchar(20)
AS
SELECT *
FROM {databaseOwner}{objectQualifier}icc_sms_phones
LEFT JOIN {databaseOwner}{objectQualifier}icc_sms_elections ON sms_elections_sms_number = phones_number
WHERE sms_elections_sms_number IS NULL
OR sms_elections_id = #Election_ID
GO
Function:
Public Overrides Function getAvailableSMSNumbers(eventid As String) As IDataReader
Dim dtable As New DataTable
Using sqlconn As New SqlConnection(Me.ConnectionString)
Using sqlcomm As New SqlCommand
Using sqlda As New SqlDataAdapter
sqlcomm.Connection = sqlconn
sqlcomm.CommandType = CommandType.StoredProcedure sqlcomm.CommandText=GetFullyQualifiedName("getAvailableSMSNumbers")
sqlcomm.Parameters.AddWithValue("#Election_ID", eventid)
sqlda.SelectCommand = sqlcomm
sqlconn.Open()
sqlda.Fill(dtable)
sqlconn.Close()
Return dtable.CreateDataReader
End Using
End Using
End Using
End Function
Where the function is used:
Public Function getAvailableSMSNumbers(eventid As String) As List(Of phoneModel)
Dim numbers As New List(Of phoneModel)
Dim number As phoneModel
numbers = CBO.FillCollection(Of phoneModel)(dal.getAvailableSMSNumbers(eventid))
For Each number In numbers 'dal.getAvailableSMSNumbers(eventid).Rows
number = New phoneModel
With number
.val = ("PHONES_NUMBER").ToString
.text = String.Format("{0:# (###) ###-####}", Long.Parse(.val))
End With
numbers.Add(number)
Next
Return numbers
End Function
If you need anymore information, let me know, and I will add it.

Answer 1

This typically occurs if the object supplied as the value of your SQL parameter is NULL, but the stored procedure does not allow null values (which yours does not). You can set a conditional breakpoint on this line sqlcomm.Parameters.AddWithValue("#Election_ID", eventid) to make sure the eventid parameter is not null.
It might also be a good idea to use defensive coding, and in your getAvailableSMSNumbers function, check to make sure eventid is not null, and if it is, throw an exception or provide some type of feedback for the user.

Answer 2

As an option you can try to re-compile your stored procedure to allow NULL parameter :
CREATE PROCEDURE {databaseOwner}{objectQualifier}getAvailableSMSNumbers
#Election_ID nvarchar(20) = NULL
AS
That means that the default value of your Parameter will be null in case there is no value on input. This solution will be nice in case you want to return empty datatable without error. In any other case you have to debug your VB code and understand where the issue starts.

Answer 3

Think about how you are calling you procedure. When you call you need to supply the value of the procedure: For example,
Call get_particular_girl_from_girlsTable("Jane")
where get_particular_girl_from_girlsTable is the procedure and "Jane" is value for parameter GirlName.

Answer 4

Did you verify if
cmd.CommandType = CommandType.**StoredProcedure**
By default, the value is Text, expecting a SELECT, INSERT or other command text.