How I can save two datagridview in one sigle table I'm using VB.NET 2015 and SQL 2014

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Hello everyone, I have a form with 2 datagridview 1 is from my table products and the other one is from my Job table, now I want to save what is in the two datagridview in a single table. But my code is not working, I'm new doing programming so please I need some help thanks ohhhh and I got this error
Exception Exception thrown: 'System.Data.SqlClient.SqlException' in System.Data.dll ("Must declare the scalar variable "@d6".") System.Data.SqlClient.SqlException
thanks .

What I have tried:

Dim cb5 As String = "insert into Bill_Detail(InvoiceID,CustomerID,ProductID,Qty,ProductPrice,TotalAmount,ProductName,JobID,JobName,JobPrice) VALUES (" & txtST_ID.Text & "," & txtID.Text & ",@d1,@d2,@d3,@d4,@d5,@d6,@d7,@d8)"
cmd = New SqlCommand(cb5)
cmd.Connection = con
cmd.Prepare()
For Each row As DataGridViewRow In DataGridView1.Rows
If Not row.IsNewRow Then
cmd.Parameters.AddWithValue("@d1", Val(row.Cells(0).Value))
cmd.Parameters.AddWithValue("@d2", Val(row.Cells(4).Value))
cmd.Parameters.AddWithValue("@d3", Val(row.Cells(3).Value))
cmd.Parameters.AddWithValue("@d4", Val(row.Cells(5).Value))
cmd.Parameters.AddWithValue("@d5", row.Cells(2).Value)
cmd.ExecuteNonQuery()
cmd.Parameters.Clear()

End If

Next
For Each row As DataGridViewRow In DataGridView2.Rows
If Not row.IsNewRow Then
cmd.Parameters.AddWithValue("@d6", Val(row.Cells(5).Value))
cmd.Parameters.AddWithValue("@d7", row.Cells(0).Value)
cmd.Parameters.AddWithValue("@d8", Val(row.Cells(1).Value))
cmd.ExecuteNonQuery()
cmd.Parameters.Clear()
End If
Next
con.Close()

Posted 23-Aug-17 8:23am

Member 13164214

Updated 23-Aug-17 14:14pm

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an0ther1 · Answer 1 · 2017-08-23T14:14:00

Your issue is self explanatory - you have declared parameters @d6, @d7 & @d8 but have not added them to your SQL Command prior to executing the query.
If you were to get past this first error - perhaps by setting the values to NULL, then you would get a similar error when you get to your second insert but the error would be "Must declare the variable @d1"

if you wanted to set the values to NULL in the respective insert statements you would do as follows;

VB

cmd.Parameters.AddWithValue("@d6", DBNull.Value)

Alternatively have 2 different Insert statements