Writing to SQL Server

$colb = @('Stuff1','Stuff2','Stuff3')
$connection_string = "Server=.\SQLExpress;AttachDbFilename=C:\Myfiles\mydb.mdf;Database=mydb;Trusted_Connection=Yes;"
$connection = New-Object System.Data.SqlClient.SqlConnection
$connection.Open()
$command = New-Object System.Data.SqlClient.SqlCommand
$command.Connection = $connection
  $command.CommandText = $sql
  $command.ExecuteNonQuery()
}
$connection.close()