Merge query from datagridview to database not executing sql, vb.net - sql

Question

I'm having a problem executing a merge query from to update or insert values from a DataGridView table into a sql server database table. Here is my code below, it doesn't give me any errors or stoppages, however I recently noticed that it has been creating completely rows in my database table dbo.schedule which contain all NULL values even that key location, could someone please help me? I'm not very familiar with merge queries in sql so please point out issues with my syntax:
Dim query As String = String.Empty
query &= "DECLARE #TaskID nvarchar(8), #Task nvarchar(50), #Start_date datetime, #Due_date datetime, #Complete bit, #Task_Manager nvarchar(8), #JRID nvarchar(10), #Entered_By char(50), #Time_Entered datetime;"
query &= "MERGE INTO schedule USING (VALUES (#TaskID, #Task, #start_date, #Due_Date, #Complete, #Task_Manager, #JRID, #Entered_By, #Time_Entered)) AS t(TaskID, Task, start_date, Due_Date, Complete, Task_Manager, JRID, Entered_By, Time_Entered) "
query &= "ON schedule.TaskID = #TaskID WHEN MATCHED THEN"
query &= " UPDATE SET schedule.TaskID = t.TaskID, schedule.Task=t.Task, schedule.start_date=t.start_date, schedule.due_date=t.due_date, schedule.complete=t.complete, schedule.task_manager=t.task_manager, "
query &= "schedule.JRID=t.JRID, schedule.Entered_by=t.Entered_by, schedule.Time_Entered=t.Time_Entered"
query &= " WHEN NOT MATCHED THEN INSERT (TaskID, Task, start_date, Due_Date, Complete, Task_Manager, JRID, Entered_By, Time_Entered)"
query &= " VALUES (#TaskID, #Task, #start_date, #Due_Date, #Complete, #Task_Manager, #JRID, #Entered_By, #Time_Entered);"
Using conn As New SqlConnection(dbLocations(0, 1))
Using comm As New SqlCommand()
With comm
For Each row As DataGridViewRow In MainSchedule.DataGridView1.Rows
If Not (row.Cells(0).Value = Nothing) Then
.Parameters.Clear()
.Connection = conn
.CommandType = CommandType.Text
.CommandText = query
insertcommand.Parameters.AddWithValue("#TaskID", TNn)
insertcommand.Parameters.AddWithValue("#Complete", "False")
insertcommand.Parameters.AddWithValue("#Task", row.Cells(0).Value)
insertcommand.Parameters.AddWithValue("#Start_date", row.Cells(1).Value)
insertcommand.Parameters.AddWithValue("#Due_Date", row.Cells(2).Value)
insertcommand.Parameters.AddWithValue("#JRID", txtJRID.Text)
insertcommand.Parameters.AddWithValue("#Task_Manager", row.Cells(3).Value)
insertcommand.Parameters.AddWithValue("#Entered_By", GetUserName())
insertcommand.Parameters.AddWithValue("#Time_Entered", Now)
NextTask()
End If
Next
End With
conn.Open()
comm.ExecuteNonQuery()
End Using
End Using

Answer 1

I figured it out in case anyone is wondering, here is my new code:
Connexion.Open()
Dim query As String = String.Empty
Dim keypos = 0
query &= "UPDATE schedule SET Task = #Task, Complete = #Complete, Start_date = #Start_date, "
query &= "Due_date = #Due_date, JRID = #JRID, Task_Manager = #Task_Manager, Entered_By = #Entered_By, Time_Entered = #Time_Entered "
query &= "WHERE TaskID = #TaskID "
query &= "IF ##ROWCOUNT = 0 INSERT INTO schedule ( TaskID, Task, start_date, Due_Date, Complete, Task_Manager, JRID, Entered_By, Time_Entered)"
query &= " VALUES ( #TaskID, #Task, #start_date, #Due_Date, #Complete, #Task_Manager, #JRID, #Entered_By, #Time_Entered);"
For Each row As DataGridViewRow In MainSchedule.DataGridView1.Rows
If Not (row.Cells(0).Value = Nothing) Then
insertcommand.Parameters.Clear()
insertcommand.CommandText = query
insertcommand.Parameters.AddWithValue("#TaskID", row.Cells(0).Value)
insertcommand.Parameters.AddWithValue("#Complete", "False")
insertcommand.Parameters.AddWithValue("#Task", row.Cells(1).Value)
insertcommand.Parameters.AddWithValue("#Start_date", row.Cells(2).Value)
insertcommand.Parameters.AddWithValue("#Due_Date", row.Cells(3).Value)
insertcommand.Parameters.AddWithValue("#JRID", txtJRID.Text)
insertcommand.Parameters.AddWithValue("#Task_Manager", row.Cells(4).Value)
insertcommand.Parameters.AddWithValue("#Entered_By", GetUserName())
insertcommand.Parameters.AddWithValue("#Time_Entered", Now)
insertcommand.ExecuteNonQuery()
End If
keypos = keypos + 1
Next
Connexion.Close()