like statement for npgsql using parameter

Question

I have a postgresql DB and i want to query the table \"Locations\" to retrieve the names of all the locations that match the name that\'s entered by the user. The column nam

Answer 1

you should use

NpgsqlCommand cmd = new NpgsqlCommand("Select * from \"Locations\" where \"LocationName\" LIKE @loc_name", con);
cmd.Parameters.AddWithValue("@loc_name", "%" + Location_Name + "%");

you were inserting too much quotes: Postgre interpretes the string between double quote as a field/table-name. Let the parameter do the escape-string job

P.S.: To concatenate string in Postgre you should use the || operator, see here. So your last query should be

string query = "Select \"LocationName\" from \"Locations\" where \"LocationName\" LIKE '%' || :loc_name || '%'";