Delete Asp.Net Databse Connection Tutorial. Receiving CS103 error code - sqldatareader

Question

I am new to programming and found these great tutorials on the Guru99.com site. Under the insert, update, Delete Asp.Net Database Connection Tutorial I was able to make the connection to the database successfully where the message came back "Connection Made".
The problem I am having is under the ASP.NET Read Database using the SQLDataReader. When I added the code and ran the program, I got a CS103 code which is The name 'sqlquery' does not exist in the current context. I thought that had to rem out the response.write and ccn.close statements thinking that the connection needed to be opened and still got the same error code. I hoping to find someone who are familiar with this tutorial. Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
String connetionString; //Variable declaration
SqlConnection cnn;
connetionString = #"Data Source=BMIS-JHanlon3\SQLEXPRESS;Initial Catalog=DemoDB;User ID=sa;Password=demo123"; //Set connection string
cnn = new SqlConnection(connetionString); //Assign connection
cnn.Open(); //open and close the connection
// Response.Write("Connection Made");
// cnn.Close();
SqlCommand command;
SqlDataReader dataReader;
String sql, Output = " ";
sql = "Select TutorialID,TutorialName from DemoDB";
command = new SqlCommand(sql, cnn);
dataReader = sqlquery.ExecuteReader();
while (dataReader.Read())
{
Output = Output + dataReader.GetValue(0) + " - " + dataReader.GetValue(1) + "</br>";
}
Response.Write(Output);
dataReader.Close();
command.Dispose();
cnn.Close();
}
}
}