Question

I wanna to know exactly how we do these thing on C# .NET 4.0 Form Application:

• Declaring SqlCeParameterCollection Object
• Adding Parameters to the collection
• Add the Collection to the Command

Here are samples of my current code:

• Declaring & Adding

  SqlCeParameterCollection Parameters = new SqlCeCommand().Parameters;
  Parameters.Add("username", Username);
  Parameters.Add("password", Password);
  

Now how to add this collection at once to the command?

Thanks

Answer 1

Try this:

string query = "...(whatever you need).....";

using(SqlCeConnection conn = new SqlCeConnection(connectionString))
using(SqlCeCommand cmd = new SqlCeCommand(query, conn))
{ 
    // just add parameters directly to SqlCeCommand object .... 
    cmd.Parameters.Add("username", Username);
    cmd.Parameters.Add("password", Password);

    conn.Open();
    cmd.ExecuteNonQuery();  // or whatever you need to do 
    conn.Close();
}

If you must set up your parameters separately, up front, then you need to do something like this (since you cannot directly use SqlCeParameterCollection):

List<SqlCeParameters> parameters = new List<SqlCeParameters>();

parameters.Add(new SqlCeParameter(.....));
parameters.Add(new SqlCeParameter(.....));

string query = "...(whatever you need).....";

using(SqlCeConnection conn = new SqlCeConnection(connectionString))
using(SqlCeCommand cmd = new SqlCeCommand(query, conn))
{ 
    // add all parameters from the list - casting to an array
    cmd.Parameters.AddRange(parameters.ToArray());

    conn.Open();
    cmd.ExecuteNonQuery();  // or whatever you need to do 
    conn.Close();
}