Avatar of Codeaddict7423
Codeaddict7423
Flag for United States of America asked on

asp.net C# page_load event reads database table and redirects

Hello,

I am trying to code the page_load event read a database table, if a column "Active" has a "1", then redirect to another page, otherwise, load the page normally,

My test page is as follows:
----------------
 protected void Page_Load(object sender, EventArgs e)
        {
               

            getData();
           
        }

        private void getData()
        {
         


            // Create a connection            
            SqlConnection MsgEmergency = new SqlConnection(connectionString);



            // Open the connection            
            MsgEmergency.Open();

            // Create a String to hold the query.            
            string query = "SELECT Active FROM tbl_News WHERE Active=1";

            // Create a SqlCommand object and pass the constructor the connection string and the query string.            
            SqlCommand queryCommand = new SqlCommand(query, MsgEmergency);

           //SqlDataReader dr = queryCommand.ExecuteReader();                

            int results = (Int32)queryCommand.ExecuteScalar();

            if (results != 1)


                    Response.Redirect("default_emergency.aspx");
                else
                    Response.Redirect("default.aspx");


            MsgEmergency.Close();
            }
           
-----------------------------------

ANY help would  be greatly appreciated.
ASP.NETMicrosoft SQL Server 2005

Avatar of undefined
Last Comment
gaurang04

8/22/2022 - Mon
kaufmed

Is the query:

SELECT Active FROM tbl_News WHERE Active=1

...guaranteed to return exactly one row? If not, then ExecuteScalar is not going to work, and you would need to revert to the ExecuteReader method.
Codeaddict7423

ASKER
kaufmed,

Thank you for the quick reply.

I tried a new tactic. My code follows:
----------
 private void getWarning()
        {

        SqlConnection MsgEmergency = new SqlConnection(connectionString);  
        SqlDataSource sds = new SqlDataSource();
        SqlDataReader EmergencyReader;

        sds.SelectCommand = "SELECT Active FROM tblPressRelease_PIO_Emergency WHERE Active=1";


        int results = Convert.ToInt32(EmergencyReader.GetByte(“Active”));


        if (results != 1)            
               
                Response.Redirect("default_emergency.aspx"); //<-- If emergency notice is active
               
                else
               
                Response.Redirect("default.aspx"); //<-- If no emergency notice is active
               
        }
----------

My problem is that the "@Active" is underlined and VS2008 is indicating ") is espected"

Again, my goal is simple: I'm trying to have the "default.aspx" page check to see if there are any rows in my table where "Active = 1" if so, redirect , if not, then load the page as normal..

Again, thanks for the quick reply.
kaufmed

As I asked earlier, does the query return exactly one row?
Your help has saved me hundreds of hours of internet surfing.
fblack61
Codeaddict7423

ASKER
Yes, when I used the ExecuteScalar option, I received only one row.  
My goal to have the default.aspx page check a database table on page_load for any "active = 1" entries.  If so, then redirect, if not, load the default.aspx normally.

Any help would be greatly appreciated.
kaufmed

for any "active = 1"
What should happen if more than one row is returned?
Codeaddict7423

ASKER
kaufmed,

My code is now ammended to include a SqlDataReader as follows:
----------
 protected void Page_Load(object sender, EventArgs e)
        {
               

           // getData();
            getWarning();
           
        }


        private void getWarning()
        {

        SqlConnection MsgEmergency = new SqlConnection(connectionString);  
        SqlDataSource sds = new SqlDataSource();
        SqlDataReader EmergencyReader;

        sds.SelectCommand = "SELECT Active FROM tbl_News  WHERE Active=1";


        int results = Convert.ToInt32(EmergencyReader.GetByte(“Active”));


        if (results != 1)

                         
               
                Response.Redirect("default_emergency.aspx"); //<-- If emergency notice is active
               
                else
               
                Response.Redirect("default.aspx"); //<-- If no emergency notice is active
               
        }
--------------


The error message I see is "specified cast is not valid"

ANY HELP would be greatly appreciated.
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.
ASKER CERTIFIED SOLUTION
gaurang04

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question