VB.Net insert multiple records - sql

Question

I have several rows in DataGridView control. And i want to insert each row into database. I tried like this. But it gives error that parameter is already added. How to add parameter name once and then add values each time and execute it each time?
Using connection As New SqlCeConnection(My.Settings.databaseConnectionString)
Using command As New SqlCeCommand("INSERT INTO table_master(item, price) VALUES(#item, #price)", _
connection)
connection.Open()
For Each r As DataGridViewRow In dgvMain.Rows
If (Not String.IsNullOrWhiteSpace(r.Cells(1).Value)) Then
command.Parameters.AddWithValue("#item", r.Cells(1).Value.Trim)
command.Parameters.AddWithValue("#price", r.Cells(2).Value)
command.ExecuteNonQuery()
End If
Next
End Using
End Using

Answer 1

Add the parameters outside the loop and inside the loop update only their values
Using connection As New SqlCeConnection(My.Settings.databaseConnectionString)
Using command As New SqlCeCommand("INSERT INTO table_master(item, price) VALUES(#item, #price)", _
connection)
connection.Open()
' Create and add the parameters, just one time here with dummy values or'
' use the full syntax to create each single the parameter'
command.Parameters.AddWithValue("#item", "")
command.Parameters.AddWithValue("#price", 0)
For Each r As DataGridViewRow In dgvMain.Rows
If (Not String.IsNullOrWhiteSpace(r.Cells(1).Value)) Then
command.Parameters("#item").Value = r.Cells(1).Value.Trim
command.Parameters("#price").Value = r.Cells(2).Value
command.ExecuteNonQuery()
End If
Next
End Using
End Using
Using AddWithValue is a nice shortcut, but has its drawbacks. For example, it is unclear what datatype is required for the column Price. Using the Parameter constructor you could specify the exact datatype for the parameter and avoid a possible conversion mistake
Dim p = new SqlCeParameter("#price", SqlDbType.Decimal)
command.Parameters.Add(p)
......