C# ASP.NET (VS 2008) DB ignores INSERT if it contains Hebrew characters

Question

Currently I'm working on a project for school, and I can't solve this.

I have a form, and if you insert to it English characters, it works fine and the info is inserted into the DB, but if I insert Hebrew characters (@form), nothing happens.

Now, to clarify, I have tested 100%, that even when I insert Hebrew characters, it gets into the 'if' block which contains the sql insert.

The whole project is managed with Visual Studio Web Developer 2008.

If I manually insert hebrew written values, the DB is able to store them, and output, but when trying to update those cells (@form), all the characters in Hebrew become question marks.

Can anyone help me? I would really appreciate it.

Thanks, Guy

EDIT:

Here is my insertion query: (Errors is a List<string>, MyAdoHelper.cs comes next)

if (Errors.Count == 0)
{
      string Add_Member = "INSERT INTO members (name, password, email, gender, registration_date) VALUES ('" + Nickname + "', '" + Password + "', '" + Email + "', '" + Gender + "', '" + DateTime.Now.ToString() + "')";

      MyAdoHelper.DoQuery(GlobalVar.DatabaseName, Add_Member);

      Errors.Add(GlobalVar.GlobalStatus["Register_Success"]);
}

MyAdoHelper.cs:

public class MyAdoHelper
{
    public MyAdoHelper()
    {
    }

    public static SqlConnection ConnectToDb(string fileName)
    {
        string path = @"C:\Users\Guy\Desktop\Project\App_Data\";
        path += fileName;
        string connString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=" +
                             path +
                             ";Integrated Security=True;User Instance=True";
        SqlConnection conn = new SqlConnection(connString);
        return conn;
    }

    public static void DoQuery(string fileName, string sql)
    {
        SqlConnection conn = ConnectToDb(fileName);
        conn.Open();
        SqlCommand com = new SqlCommand(sql, conn);
        com.ExecuteNonQuery();
        com.Dispose();
        conn.Close();
    }

    public static int RowsAffected(string fileName, string sql)       
    {
        SqlConnection conn = ConnectToDb(fileName);
        conn.Open();
        SqlCommand com = new SqlCommand(sql, conn);
        int rowsA = com.ExecuteNonQuery();
        conn.Close();
        return rowsA;
    }

    public static bool IsExist(string fileName, string sql)
    {
        SqlConnection conn = ConnectToDb(fileName);
        conn.Open();
        SqlCommand com = new SqlCommand(sql, conn);
        SqlDataReader data = com.ExecuteReader();
        bool found;
        found = (bool)data.Read();

        conn.Close();
        return found;
    }

    public static DataTable ExecuteDataTable(string fileName, string sql)
    {
        SqlConnection conn = ConnectToDb(fileName);
        conn.Open();
        SqlDataAdapter tableAdapter = new SqlDataAdapter(sql, conn);
        DataTable dt = new DataTable();
        tableAdapter.Fill(dt);
        return dt;
    }

    public static void ExecuteNonQuery(string fileName, string sql)
    {
        SqlConnection conn = ConnectToDb(fileName);
        conn.Open();
        SqlCommand command = new SqlCommand(sql, conn);
        command.ExecuteNonQuery();
        conn.Close();
    }

    public static int CountTableRows(string TableName)
    {
        SqlConnection Conn = MyAdoHelper.ConnectToDb(GlobalVar.DatabaseName);
        Conn.Open();
        string TotalRows = "SELECT COUNT(*) FROM " + TableName;
        SqlCommand Cmd = new SqlCommand(TotalRows, Conn);
        return (int)Cmd.ExecuteScalar();
    }
}

Answer 1

If you use microsoft sql server, try something like this.

INSERT INTO tabelle (Spalte) VALUES (N'äüö');

And make also sure, that you use nvarchar