Erro com Npgsql + ASP.NET + C#

Saudações srs   Estou com o seguinte código   NpgsqlConnectionc conn = new NpgsqlConnection("STRING DE CONEXÃO"); conn.Open(); NpgsqlCommand command = new NpgsqlCommand(sql, conn); Int32 rowsaffected; //try //{ rowsaffected = command.ExecuteNonQuery(); Console.WriteLine("Linhas incluidas ", rowsaffected); //} //finally //{ conn.Close();       Com o seguinte erro... e não estou encontrando o maldito erro...   ERROR: 42601: syntax error at or near ".0"Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: Npgsql.NpgsqlException: ERROR: 42601: syntax error at or near ".0"

Source Error: 

Line 54: //try Line 55: //{ Line 56: rowsaffected = command.ExecuteNonQuery(); Line 57: Line 58: Console.WriteLine("Linhas incluidas ", rowsaffected);
Source File: c:\Users\Roberson\Documents\Visual Studio 2008\WebSites\Site\portal\Default.aspx.cs    Line: 56