how to store information to dbf files by iraninanSystem codePage

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C#

Hi gays

I am bound to Dbf file by the below code and store my information

public int save_dbf_func(string source_dbf, string str_command)
{
    try
    {
        OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + source_dbf + ";Extended Properties=dBASE IV;User ID=;Password=;"); // give your path directly
        OleDbCommand Cmd = new OleDbCommand();

        if (con.State == ConnectionState.Closed) con.Open();
        Cmd.CommandText = str_command;
        Cmd.Connection = con;
        int RowEffect = Cmd.ExecuteNonQuery();
        con.Close();
        return RowEffect;
    }
    catch (Exception ex)
    {
        var mm = ex.ToString();
        return -1;
    }
}

for example :

save_dbf_func("c:\folder", "insert into file.dbf (fName , lName) values ('مرتضی' , 'زند')")

And by a dll convert my string to Iranian system codePage for example:

CONVERTLib.ConvertorClass convert_dll = new CONVERTLib.ConvertorClass();

    textBox1.Text = convert_dll.WinToIran('مرتضی');

converted string into the textbox is correct but when I store the string in the Dbf file for most characters show ???? ??? ?????.

Please guide me how to make the information stored in the database that they are not damaged.

Thanks