SQL Server CE : if exist update else insert - sql

Question

How can I INSERT a row if does not yet exist in a SQL Server CE database table and UPDATE it if it exists?
I have tried lot of SQL queries and keep getting errors. This is not working.
IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue')
UPDATE Table1 SET (...) WHERE Column1='SomeValue'
ELSE
INSERT INTO Table1 VALUES (...)
Update:
I have found this which is working for me. Any other good suggestion is welcome.
INSERT INTO Table1 VALUES (...)
SELECT (........)
WHERE NOT Exists (SELECT ........)
-- INSERT with Default value if not exist. Next, UPDATE it
UPDATE Table1 SET (...) WHERE Column1='SomeValue'

Answer 1

I know you've tagged sql and sql-server-ce but in case you're open to using c# code to fix this.. :
Using c# and result sets this is what I did for my mobile app using SQL CE:
// UpdateRow is a struct/class to hold the data for each row
// SqlCeConn = connection string for db
SqlCeCommand cmd = new SqlCeCommand("Table1", SqlCeConn);
cmd.CommandType = CommandType.TableDirect;
cmd.IndexName = "Column1";
using (SqlCeResultSet rsltSet = cmd.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable))
{
if (UpdateRow.Column1> 0) // or != "" if it's string etc
{
if (rsltSet.Seek(DbSeekOptions.FirstEqual, UpdateRow.Column1))
FoundRecord = true;
}
rsltSet.Read();
if (FoundRecord)
{
// Update
rsltSet.SetInt32(1, UpdateRow.Column1);
rsltSet.SetInt32(2, UpdateRow.Column2);
// etc
rsltSet.Update();
}
else
{
// Insert new record
SqlCeUpdatableRecord record = rsltSet.CreateRecord();
record.SetInt32(0, UpdateRow.Column1);
record.SetInt32(1, UpdateRow.Column2);
// etc
rsltSet.Insert(record, DbInsertOptions.PositionOnInsertedRow);
}
}
cmd.Dispose();
}
catch (Exception e)
{
// Deal with exception
}