Web Forms :: Getting Value Of A Variable In A Class?
Jul 12, 2010I created a custom MembershipUser and added some values, like this:
[Code]....
How do to retrieve the value of one variable of this class?
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Public Variable C# - Variable Is Assigned A Value In Another Class?
Mar 7, 2010[Code]....
The variable is assigned a value in another class like this:
[Code]....
Web Forms :: Class-level Variable Loses It's Value?
Jun 22, 2010Google usually solves my problems for me, but this one has me stumped. I have a page with the following code, in which lstPayments is a listview control:
public partial class frmPerson : System.Web.UI.Page
{
protected bool paymentWarning = false;
protected void Page_PreRender(object sender, EventArgs e)
{
if (paymentWarning == true)
{
string alertText = "alert('Hello World');";
if (!ClientScript.IsStartupScriptRegistered("Alerter"))
ClientScript.RegisterStartupScript(this.GetType(), "Alerter", alertText, true);
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}
protected void lstPayments_ItemInserted(object sender, ListViewInsertedEventArgs e)
{
paymentWarning = true;
}
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As you can see, I'm trying to get an alert box displayed after a new payment is entered. As I expect, lstPayments_ItemInserted is executed first, and paymentWarning is duly set to true. However, when Page_PreRender subsequently executes, paymentWarning has been re-initialised: it's false again!
The only way I can get the class-level variable paymentWarning to retain it's value between the two event handlers is to declare it static, which I don't want to do for obvious reasons. There must be something I am failing to understand about how class-level variables work in aspx pages.
Web Forms :: One Sub In UserClass Not Recognizing Declaration Of Class Variable?
Jul 19, 2010I have a user control in which I have declared a connection string as a private class variable.
I have a bunch of cascading dropdown lists in this control.
In one of my subroutines PopulateDdlPostalCodes I get an error "Connection was not initialized".
In all the other subs that use Conn, the class variable is being recognized.
If I duplicate the declaration of Conn in this sub then all works ok.
Why is this sub different than all the others?
[Code]....
Using And Changing A Variable In Another Class (c#)?
May 13, 2010i have just started to learn silverlight, and i'm using C# as code.
now i want to declerate a variable in one class "mainpage" and i want to change the variable in the class "mainpage"
but i wanna do it through another class called "contact"
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
[Code]....
i now know that i can't change the variable "pageopen" because it's static, but i don't know how to fix it?
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public partial class MyForm : System.Web.UI.Page
{
private bool PreviouslySubmitted;
protected void Page_Load(object sender, EventArgs e)
{
MyButton.Click +=
(o, i) =>
{
q = from a in db.TableA
where (a.SomeField == SomeValue)
select a;
if(q.Any())
{
PreviouslySubmitted = true;
//populate the form's fields with values from database for user to revise
}
}
MyNextButton.Click +=
(o, i) =>
{
//the value of PreviouslySubmitted is false at this point,
//even if I made sure it was set to true the previous postback
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//update database
}
else
{
//insert into database
}
}
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[code]....
In my user control that inherits from BaseUsercontrol The ascx has:
<asp:Button id="btnTest" runat="server" OnClick="OnButtonClick" />
Why can't I use the hidden input variable this way?
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Will all of these point to the same class?
Which one is preferable >object< defined declaratively inside global.asax or static class ?
examples:
<object runat="server" scope="application" class="classname" ID="objID"></object>
VS
public static class classname {}
VS
Application("a") = new classname();
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Oct 20, 2010Nested GridView Control returns "Object variable or With block variable not set" when outer GridView returns rows.
The Nested GridView Control works as long as the outer GridView returns rows, the following code works: [Code]....
Object variable or With block variable not set.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object variable or With block variable not set.
Source Error:
Line 118: If e.Row.RowType = DataControlRowType.DataRow Then
Line 119: Dim myStatus_ID As SqlDataSource = CType(e.Row.FindControl("sqlDeviceStatusAssign"), SqlDataSource)
Line 120: If Not e.Row.DataItem("Status_ID") Is Nothing Then
Line 121: myStatus_ID.SelectParameters(0).DefaultValue = e.Row.DataItem("Status_ID")
Line 122: End If
I have tried checking for IsDbNull and checking to see if a label exists in a given row. This code *If Not e.Row.DataItem("Status_ID") Is Nothing Then* appears to do nothing.Same with the following:
*Dim localLblItemReference As Label = CType(e.Row.FindControl("lblItemReference"), Label)
*If Not localLblItemReference Is Nothing Then
******************************************************************************************
To further clarify my question above, I am looking for a method to detect e.Row.DataItem("Status_ID") is nothing/null due to the outer GridView returning 0 results in a query.I have a (Outer) GridView Control with another GridView Control inside of a template field with it's associated SqlDataSource control.
In the "Protected Sub GridViewReport_RowCreated", I provide the Select Parameter for the associated SqlDataSource with the DataItem row value.When the (Outer) GridView Control does not return any rows, the "e.Row.DataItem("Status_ID")" throws a:
Exception Details: System.NullReferenceException: Object variable or With block variable not set.
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Sep 16, 2010I have this Control directive in a usercontrol (i've changed the namespace and class name):
<%@ Control Language="C#" AutoEventWireup="true" Inherits="Namespace.Path.To.ClassName" %>
<asp:TextBox runat="server" ID="txtComment" TextMode="MultiLine" ValidationGroup="comment" />
ClassName is a class that lives in a class library and this is the class:
namespace Namespace.Path.To
{
public class ClassName : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.TextBox txtComment;
protected void Page_Load(object sender, EventArgs e)
{
HttpContext.Current.Response.Write(txtComment == null);
HttpContext.Current.Response.End();
}
Web Forms :: Why Class Of User Control Is Unavailable In Another Class File
Nov 18, 2010I have build a UserControl with separate code behind file.In that code behind file i have defined some public properties in the Partial class of user control that was automatically generated.Those properties will initialize some properties of controls that are used in the control.Now, in .aspx page i used this User Control and initialized the public properties through code behind of aspx page for dynamic contents.
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Oct 5, 2010How can I to use System.Drawing.Bitmap class into athoer class?
using System.Data;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
namespace University
{
public class Class1
{
System.Drawing.Bitmap BMP=new System.Drawing .Bitmap();
}
}
when I use System.Drawing.Bitmap gives error this class does not exists
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Dec 9, 2010can we grab a global variable or Session or View State variable in the javascript or using jquery?
State Management :: Public Variable Vs Session Variable To Store Logged In UserID
May 17, 2010I have a web application which uses a session variable to store the logged in userid. If no user is logged in, of course this variable will be empty and the contents displayed on my website are meant for guests. If there is a user logged in, the user specific controls/access/links will then be a displayed.
I am now having issues with my hosting where on shared application pool, the worker recycle is triggered every 90 minutes, this will clear sessions causing all my users to be logged out. I opted for a dedicated application pool, which got worse because I am only allocated 50MB memory limit and if this is reached, the worker recycle is triggered and I lose my sessions again. I have tried as much as possible optimization techniques, e.g. dispose where possible, close connections, disable viewstate for static controls etc but my memory per instance keeps building up from page to page without any signs of improvement. I don't use loops nor store huge objects like bitmaps etc but my sessions are now gone even faster than 90 minutes in shared application pool before.
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C# - Hidden Variable Vs Server Variable Accessing On Client Side In Javascript
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Jul 16, 2010I'm am not quite sure why I am getting this error.
Dim numUsers as Integer
Using myConnection as New System.Data.SqlClient.SqlConnection("Data Source=(local);InitialCatalog=dbtest;Integrated Security=True")
Dim queryString As String = "SELECT COUNT(*) AS Num_Of_User FROM tblusers WHERE username=@username AND password=@password"
Using myCommand as New System.Data.SqlClient.SqlCommand(queryString, myConnection)
myConnection.Open
myCommand.Parameters.AddWithValue("@username", requestName)
myCommand.Parameters.AddWithValue("@password", requestPass)
numUsers = myCommand.ExecuteScalar()
End Using
End Using
This error occurs on the first using statment.