C#

b.sahahf wrote:

you can send me a code?

static void Serialize() 
    {
        // Create a hashtable of values that will eventually be serialized.
        Hashtable addresses = new Hashtable();
        addresses.Add("Jeff", "123 Main Street, Redmond, WA 98052");
        addresses.Add("Fred", "987 Pine Road, Phila., PA 19116");
        addresses.Add("Mary", "PO Box 112233, Palo Alto, CA 94301");

        // To serialize the hashtable and its key/value pairs,  
        // you must first open a stream for writing. 
        // In this case, use a file stream.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Create);

        // Construct a BinaryFormatter and use it to serialize the data to the stream.
        BinaryFormatter formatter = new BinaryFormatter();
        try 
        {
            formatter.Serialize(fs, addresses);
        }
        catch (SerializationException e) 
        {
            Console.WriteLine("Failed to serialize. Reason: " + e.Message);
            throw;
        }
        finally 
        {
            fs.Close();
        }
    }

I are Troll

keefb wrote:

The design in the OP needs refactoring [...] unless there is a specific reason for dealing with strings specifically.

Clive D. Pottinger wrote:

The first ctor (MyClass(string initStr)) is used when the initStr holds a formula that needs to be parsed and evaluated to get the value

keefb wrote:

If I understand you correctly, by passing the formula as a string will require the current class to be responsible for performing the parsing as well as whatever this class is meant to do with the result, this is probably bad object encapsulation.

keefb wrote:

...unless you are parsing text entries from a user or some other source (e.g. text input from a UI or file), writing formulas in strings and then evaluating them is bad design...

DataTable dataTable = new DataTable("MyTable");
dataTable.Columns.Add("Column1");

DataRow dataRow = dataTable.NewRow();
dataRow["Column1"] = "0";
dataTable.Rows.Add(dataRow);

DataRow[] foundRows = dataTable.Select("Column1 = 0");
Trace.Write(foundRows); // <- Count = 1

dt.Select("Status =1");

dataGridView1.DataSource = dtSelect("Status =1");