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I'm making a shopping cart in asp.net with c# using DataTable stored in Session and all items stored in DataTable.
public DataTable dtCart = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["dtCart"] == null) { CreateCartTable(); }
}
}
protected void CreateCartTable()
{
dtCart.Rows.Clear();
dtCart.Columns.Clear();
dtCart.Columns.Add(new DataColumn("Prd_Id", Type.GetType("System.String")));
dtCart.Columns.Add(new DataColumn("Prd_Name", Type.GetType("System.String")));
dtCart.Columns.Add(new DataColumn("Prd_Img", Type.GetType("System.String")));
dtCart.Columns.Add(new DataColumn("Qty", Type.GetType("System.Int32")));
dtCart.Columns.Add(new DataColumn("Rate", Type.GetType("System.Decimal")));
dtCart.Columns.Add(new DataColumn("Amount", Type.GetType("System.Decimal")));
dtCart.Columns.Add(new DataColumn("TotalAmount", Type.GetType("System.Decimal")));
Session["dtCart"] = dtCart;
}
Is this right approach or any other way is more elegant and light on application?
FYI I'm using web forms.
You can make a class to cart:
public class Cart
{
public string Prd_Id{set;get;}
public string Prd_Name{set;get;}
//and so on...
}
then in page:
Cart obj=new Cart{Prd_Id="1",Prd_Name="John"};
Session["dtCart"]=obj;
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I have a problem with the code in rec.Speechreconized += rec_Speachrecognized.
I have been looking for answers in the internet but it just won't work. I hope someone can help me.
namespace ai
{
public partial class Form1 : Form
{
SpeechSynthesizer s = new SpeechSynthesizer();
Choices list = new Choice {};
public Form1()
{
SpeechRecognitionEngine rec = new SpeechRecognitionEngine();
list.Add(new String[] {"Hello", "how are you"});
Grammar gr = new Grammar(new GrammarBuilder(list));
try
{
rec.RequestRecognizerUpdate();
rec.LoadGrammar(gr);
rec.SpeechRecognized += rec_Speachrecognized();
rec.SetInputToDefaultAudioDevice();
rec.RecognizeAsync(RecognizeMode.Multiple);
}
catch{return;}
s.Speak("Hi, I am Ms M, what can i help you?");
InitializeComponent();
}
public void Say(String h)
{
s.Speak(h);
}
private EventHandler<SpeechRecognizedEventArgs> rec_Speachrecognized(object sender, SpeechRecognizedEventArgs e)
{
string r = e.Result.Text;
if(r == "hello")
{
Say("hi");
}
throw new NotImplementedException();
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
}
you need to change this line
rec.SpeechRecognized += rec_Speachrecognized();
to
rec.SpeechRecognized += rec_Speachrecognized;
basically remove the () at the end since the event will pass the params but this way you are calling the method without params
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how to do that if user did not did anything on the website for a set amount of time the website will log out him?
is it from the c# page?
how can i tocount the time sincethe last touch on something?
and how can i alert it?
plss help
i want to add it here:
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Conect"]!=null)
{
if (!(bool)Session["Conect"])
{
Response.Redirect("Must-Had.aspx", true);
}
}
else
Response.Redirect("Must-Had.aspx", true);
if (Session["val"]!=null)
{
if ((bool)Session["val"])
{
limission4.Visible = true;
mission4.InnerText =(string)Session["tit"];
}
}
if (Session["val2"] != null)
{
if ((bool)Session["val2"])
{
limission5.Visible = true;
mission5.InnerText = (string)Session["tit2"];
}
}
}
Place this somewhere between the <body> and </body> tags.
<script type="text/javascript">
var timeoutHandle = window.setTimeout("window.close();", 3000);
window.onscroll = function (e) {
window.clearTimeout(timeoutHandle);
timeoutHandle = window.setTimeout("window.close();", 3000);
}
</script>
You can change the "3000" to whatever amount of time you want the page to last.
You can also change the "window.close();" to whatever you want the page to do when the time runs out. The "window.close();" command will just close the page.
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I am building a program for my course in which i need global objects as i intend to have the object accessible from many forms and edited also. Before saying just use global variables i cant the specs state for use of OOP.
my latest attempt to fix this is using a public class but this gave a protection error problem
Code:
Form1.cs (forgot to rename and not re doing all the code and design)
public class ObjectsGlobal
{
Bays bay1 = new Bays();
Bays bay10 = new Bays();
}
frmInput.cs
private void btnAdd_Click(object sender, EventArgs e)
{
if ( 1 == Convert.ToInt32(nudBayNum))
{
ObjectsGlobal.bay1.CarMake = txtMake.Text;
}
}
any ideas are welcome at this point
Change it to:
public static class ObjectsGlobal
{
public static Bays bay1 = new Bays();
public static bay10 = new Bays();
}
Also, as recommended in a comment I have now read, take a look at the Singleton Pattern.
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I'm a beginner on Visual Studio so, please, be gentle :)
Here the code i'm using :
private void button1_Click(object sender, EventArgs e)
{
using (KrqcSDBEntities context = new KrqcSDBEntities())
{
activite monActivite = new activite();
monActivite.lieu_activite = "Paris";
monActivite.nom_activite = "Natation";
context.activite.AddObject(monActivite);
activite test = context.activite.FirstOrDefault(o => o.id == 1);
context.SaveChanges();
}
}
I succesfully succeed to get value from my DB but i can't add anything in it without any error.
Can you please have a look on it and try to help me ?
It would be very nice !
Thanks you
SaveChanges first, then get the item from data store:
private void button1_Click(object sender, EventArgs e)
{
using (KrqcSDBEntities context = new KrqcSDBEntities())
{
activite monActivite = new activite();
monActivite.lieu_activite = "Paris";
monActivite.nom_activite = "Natation";
context.activite.AddObject(monActivite);
context.SaveChanges();
activite test = context.activite.FirstOrDefault(o => o.id == 1);
}
}
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Closed 9 years ago.
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I have a question about creating calculator in C# Windows Form Application.
I want it to be possible write with form buttons an expression in textbox so for example 2+3+7= and after pressing "=" button program will read all digits and signs and perform calculation... I don't know from where to start and how could do it in such a way. Any help to any reference or smth to look at how to start doing such a expressions?
Main thing is how to read, seperate and after calculate values from textbox.
Thanks.
With the Split method you could solve this rather easy.
Try this:
private void button1_Click(object sender, EventArgs e)
{
string[] parts = textBox1.Text.Split('+');
int intSum = 0;
foreach (string item in parts)
{
intSum = intSum + Convert.ToInt32(item);
}
textBox2.Text = intSum.ToString();
}
If you would like to have a more generic calculation, you should look at this post:
In C# is there an eval function?
Where this code snippet would do the thing:
public static double Evaluate(string expression)
{
System.Data.DataTable table = new System.Data.DataTable();
table.Columns.Add("expression", string.Empty.GetType(), expression);
System.Data.DataRow row = table.NewRow();
table.Rows.Add(row);
return double.Parse((string)row["expression"]);
}
private void button1_Click(object sender, EventArgs e)
{
textBox2.Text = Evaluate(textBox1.Text).ToString();
}