CODEWITHSUNDEEP
c#asp.netsql
kelly
kelly

Reputation: 117

Unable to cast object of type 'ASP.Catalogue_aspx' to type 'System.Web.UI.WebControls.LinkButton'

I am retrieving my toyName from database and want to session it over to the next page. My session has nothing wrong but I have this error which state as below and i not sure where have i gone wrong. I have 2 link buttons in my .aspx page and this link button that is having error is the second linkButton i created.

Error Message:

Unable to cast object of type 'ASP.Catalogue_aspx' to type 'System.Web.UI.WebControls.LinkButton'.

Source Error: 

Line 13:     protected void Page_Load(object sender, EventArgs e)
Line 14:     {
Line 15:         LinkButton LinkButton = (LinkButton)sender;
Line 16:         int toyID = Convert.ToInt32(LinkButton.CommandName);
Line 17:

Here is my page_load .cs code:

protected void Page_Load(object sender, EventArgs e)
{
    LinkButton LinkButton = (LinkButton)sender;
    int toyID = Convert.ToInt32(LinkButton.CommandName);


    string strConnectionStr = ConfigurationManager.ConnectionStrings["ASPNETConnectionString"].ConnectionString;
    string sql = "SELECT toyID, toyName FROM Toys WHERE toyID=@toyID";


    SqlConnection myConnect = new SqlConnection(strConnectionStr);
    myConnect.Open();
    SqlCommand command = new SqlCommand(sql, myConnect);
    command.Parameters.AddWithValue("@toyID", toyID);


    SqlDataReader dr = command.ExecuteReader();

    while (dr.Read())
    {
        Label1.Text = dr["toyName"].ToString();
    }

    dr.Close();
    myConnect.Close();
}

Upvotes: 0

Views: 582

Answers (2)

Bex
Bex

Reputation: 4918

You can't cast a page as a link button.. that's never going to work. When you are casting the sender in the page load you are technically casting the page

If you want to use session you need to put 

session["something"]= what ever you are trying to save

Then to retrieve it

var myVariable = session["something"] (maybe cast this as something)

Other than that I am not sure what you are trying to do

Upvotes: 0

SLaks
SLaks

Reputation: 887857

That's totally wrong.

The sender for Page_Load is the page, not a LinkButton.

Upvotes: 1

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