Calling SQL Stored procedure from codebehind problems

hello, I am having a bit problems with this one and I dont know why, it should work.

The stored procedure works fine when I execute, but when I use codebehind to call it, thats where it does not work.

codebehind (vb .net)

Function ssRadioStatistik(ByVal ChannelName As String, ByVal AlbumTitle As String, ByVal TrackTitle As String, ByVal DisplayArtist As String, ByVal StartTime As String)
        Try
            If DisplayArtist.ToLower.Contains("wrd1") = True And DisplayArtist.ToLower.Contains("wrd2") = True Then

'tested with a msgbox to see if it comes to here and it does...

                Dim myConnectionString As String = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString

                Response.Write(myConnectionString)

                Dim myConnection As SqlClient.SqlConnection = New SqlClient.SqlConnection(myConnectionString)
                myConnection.Open()
                Try
                    Dim command As SqlClient.SqlCommand = New SqlClient.SqlCommand("ErDetsStoredProcedure", myConnection)
                    command.CommandType = CommandType.StoredProcedure
                    command.Parameters.AddWithValue("@ChannelName", ChannelName)
                    command.Parameters.AddWithValue("@AlbumTitle", AlbumTitle)
                    command.Parameters.AddWithValue("@TrackTitle", TrackTitle)
                    command.Parameters.AddWithValue("@DisplayArtist", DisplayArtist)
                    command.Parameters.AddWithValue("@StartTime", StartTime)
                Finally
                    myConnection.Close()
                End Try

            End If
        Catch ex As Exception
        End Try
    End Function

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Stored procedure code(works fine when executed)

ALTER PROCEDURE [Joachim_ErDets].[ErDetBieberStoredProcedure]
	@ChannelName nvarchar(50),
    @AlbumTitle nvarchar(50),
	@TrackTitle nvarchar(50),
	@DisplayArtist nvarchar(50),
	@StartTime datetime
AS

IF NOT EXISTS (SELECT * FROM ErDetsTable WHERE StartTime = @StartTime AND ChannelName = @ChannelName)
BEGIN
    INSERT INTO ErDetsTable (ChannelName, AlbumTitle, TrackTitle, DisplayArtist, StartTime, DatetimeStamp)
    VALUES (@ChannelName, @AlbumTitle, @TrackTitle, @DisplayArtist, @StartTime, GETDATE())
END

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it gives no error when I try the use the codebehind to execute it, but it does not write anything in table. (tested the stored procedure by executing it, works great)

Thanks in advance, I have no clue why this does not work.