How do I query SQL data then insert or update depending on the result - vb.net

Question

I am a beginner at this. But let me explain what I need to do and show you my code
I have a CSV file.
inside the CSV I have a projectnumber, city,state,country
I have a SQL table with the same column
I want to use vb.net to check if projectnumber exists in sql table
if exists then I want to run update statement.
if it does not exists then I want to run insert statement.
I have the program working . but I am just wondering if this would be the correct way or my code is some hack way of doing it.
LEGEND:
DTTable is data table with CSV inside
DT is data table with SQL result data
First I fill insert all lines in the CSV into a data table
Dim parser As New FileIO.TextFieldParser(sRemoteAccessFolder & "text.csv")
parser.Delimiters = New String() {","}
parser.ReadLine()
Do Until parser.EndOfData = True
DTTable.Rows.Add(parser.ReadFields())
Loop
parser.Close()
then I use oledbdataadapter to run the select query and fill another data table with the result of the select statement
SQLString = "select * from tblProjects where ProjectID='" & DTTable.Rows.Item(i).Item("ProjectNumber") & "'"
da = New OleDb.OleDbDataAdapter(SQLString, Conn)
da.Fill(dt)
then I run if statement
If dt.Rows.Count = 0 then
SQLString = "INSERT STATEMENT HERE"
oCmd = New OleDb.OleDbCommand(SQLString, Conn)
oCmd.ExecuteNonQuery()
Else
SQLString = "UPDATE STATEMENT HERE"
oCmd = New OleDb.OleDbCommand(SQLString, Conn)
oCmd.ExecuteNonQuery()
End if
ALL above code is run inside a for loop, to go through all the lines in the CSV
For i = 0 To DTTable.Rows.Count - 1
what do you think?
please advise
thank you

Answer 1

Personally, I wouldn't use .NET. I would import the table into a temp SQL Server table and then write my queries to insert/update data from the temp table to the regular table. This is certainly the way you want to go if the dataset is large.
If this is a process you need to repeat frequently, you could make an SSIS package.

Answer 2

I'd run the select query using datareader = command.ExecuteReader(). Then:
If datareader.Read() then
'Update query using datareader(0) as a where predicate goes here
ElseIf datareader(0) = Nothing then
'Insert query goes here
End If
I should say, I'm a relative novice too though, so maybe others can suggest a more elegant way of doing it.