How to know if connection has been made

Question

I am trying to access and insert data with c# using ado.net. I have the sql server installed in my computer and hence I feel the machine name will be the server name. Following are the steps I am using to connect to the database.

private void dbButton_Click(object sender, EventArgs e)
    {
         connectionString = "Server = ITSL-SALT-33; Database = sampleADO; User Id = sa; Password = abcd;";
         try
         {
             SqlConnection conn = new SqlConnection(connectionString);
             conn.Open();
             MessageBox.Show("Successfully connected to the database.");
             insertButton.Enabled = true;
             loadButton.Enabled = true;

         }


         catch (Exception exc)
         {
             Console.WriteLine(exc.ToString());
             MessageBox.Show("Connection attempt failed");
         }
    }

Below is the code for insert Button:

private void insButton_Click(object sender, EventArgs e)
    {
       cmdString="INSERT INTO books (name,author,price) VALUES (@val1, @va2, @val3)";

        SqlCommand comm = new SqlCommand();

    comm.Connection = conn;
    comm.CommandText= cmdString;
    comm.Parameters.AddWithValue("@val1", txtBook.Text);
    comm.Parameters.AddWithValue("@val2", txtAuthor.Text);
    comm.Parameters.AddWithValue("@val3", txtPrice.Text);
    comm.Parameters.AddWithValue("@val3", txtComments.Text);
    try
    {
        MessageBox.Show(conn.DataSource);
        Console.WriteLine(comm.ExecuteNonQuery());
        Console.ReadLine();

    }
    catch(Exception exc)
    {
        MessageBox.Show("In Insert catch");

    }
}

When I am trying to insert data, it is always showing in the messagebox that "in insert catch". I cannot understand where is the fault or if there is any step I am missing. I am new in using database or sql stuffs, just trying to learn how to interact with a database in .net. Please guide.

Answer 1

I think there is a just a small mistake just change you @va2 in your INSERT query to @val2 and it should work now..

cmdString="INSERT INTO books (name,author,price) VALUES (@val1, @va2 , @val3)";