Use string.Split to break each line of the input in two:
string[] parts = input.Split(',');
Then use string.Format to "bolt them together" again:
if (parts.Length == 2)
{
string output = string.Format("\"{0}\",\"{1}\"", parts[0], parts[1]);
...
Or even like this:
if (parts.Length == 2)
{
string output = string.Format("(\"{0}\",\"{1}\")", parts[0], parts[1]);
...
[edit]
Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.
When you concatenate strings, you cause problems because SQL receives commands like:
SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'
The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:
SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;
Which SQL sees as three separate commands:
SELECT * FROM MyTable WHERE StreetAddress = 'x';
A perfectly valid SELECT
DROP TABLE MyTable;
A perfectly valid "delete the table" command
And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.
When you read data from your CSV and just process it to a "SQL Compatible" command, you put yourself at exactly the same risk.
So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?
[/edit]