Switch statement querying MYSQL database and using in my C# program

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I am trying to build a program that if user selects something from dropdown then a label will show depending on what is selected.

EG:

selects Dog from dropdown the label will show "Dog is £20"

selects Cat from dropdown the label will show "Cat is £15"

I am not doing it correct and have been at it for hours any help would be much appreciated.

**Code so far**

C#

DataSet ds = new DataSet();
           MySqlConnection cs = new MySqlConnection(@"SERVER= 000.000.00.000;username=myusername;password=******; Initial Catalog = mydatabase");
           MySqlDataAdapter da = new MySqlDataAdapter();

           protected void Page_Load(object sender, EventArgs e)
           {
               MySqlCommand cd = new MySqlCommand("SELECT * FROM pets", cs);
               cs.Open();
               MySqlDataReader ddl = cd.ExecuteReader();
               DdPetPist.DataSource = ddl;
               DdPetPist.DataValueField = "Specie";
               DdPetPist.DataTextField = "Specie";
               DdPetPist.DataBind();
               cs.Close();
               cs.Dispose();
           }

**Select Index Change**

C#

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            MySqlCommand cd = new MySqlCommand("SELECT CAST(Specie AS varchar) + '#' + CAST(Specie_Price AS varchar) AS Specie FROM pets", cs);
            cs.Open();
            PetPrice.Text = Convert.ToString(cd.ExecuteReader());
            cs.Close();
        }

Please any help will be grate I have been stuck on this problem for hours and would like to move on to my next task at hand.
Many Thanks.

Posted 21-Nov-13 7:41am

Ben Oats

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BillWoodruff 21-Nov-13 19:54pm

I don't see how you expect to get any result when the user selects an item in the DropDown: you're not doing anything in the SelectedIndexChanged EventHandler code to use the current selection in the DropDown.

Am I missing something ?

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Ron Beyer · Answer 1 · 2013-11-21T07:48:00

Your problem is on these two lines:

C#

MySqlCommand cd = new MySqlCommand("SELECT CAST(Specie AS varchar) + '#' + CAST(Specie_Price AS varchar) AS Specie FROM pets", cs);

//And

PetPrice.Text = Convert.ToString(cd.ExecuteReader());

The first one will return all your records cast as the string concatenation, I suspect you only want one, so you need to have a WHERE clause in the SQL statement (WHERE Specie = 'Whatever').

The second part, ExecuteReader does just that, it creates an IDataReader that can page through the results of your query. When you cast it to a string, you just get back the data type as a string, what you want is:

C#

PetPrice.Text = Convert.ToString(cd.ExecuteScalar());

Which returns the first column of the first result in your query.