Re: Typed Datasets vs. Custom Classes - C# Discussion Boards

Re: Little indian vs Big Indian [modified]

Drew McGhie2-Aug-06 8:19

2-Aug-06 8:19

Try spelling it right. its "endian," referring to the end of the significant bit. A quick google search should do you just fine.

-- modified at 14:19 Wednesday 2nd August, 2006

Re: Little indian vs Big Indian

Guffa2-Aug-06 9:04

Guffa

2-Aug-06 9:04

"Mmmmmm. Juicy Fruit."
-- Big indian (Chief Bromden)

Wink | ;)

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b { font-weight: normal; }

Re: Little Endian vs Big Endian

Ennis Ray Lynch, Jr.2-Aug-06 8:25

Ennis Ray Lynch, Jr.

2-Aug-06 8:25

The IPAddress class provides methods with that functionality for several types.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

Re: Little Endian vs Big Endian

seq-2-Aug-06 8:29

seq-

2-Aug-06 8:29

ok guyz thx for the answer I found on google what I was looking for.. before that I couldnt find because I spelt it incorrect ;] thx for help anyway

Re: Little Endian vs Big Endian

engsrini2-Aug-06 8:33

engsrini

2-Aug-06 8:33

<br />
 string str = "000CB8B8";            <br />
<br />
            char[] ch=str.ToCharArray();<br />
            <br />
            string strev = "";<br />
            for (int i = (ch.Length-1); i >= 0; i--)<br />
            {<br />
                strev += ch[i].ToString();<br />
            }<br />
reversed string will be on strev<br />

Re: Little Endian vs Big Endian

Guffa2-Aug-06 8:52

Guffa

2-Aug-06 8:52

Reversing the nibbles won't correctly change the endianess of the number. You have to reverse the bytes:

string number = "000CB8B8";

string swapped = string.Empty;
for (int i = number.Length - 2; i >= 0; i -= 2) {
   swapped += number.Substring(i, 2);
}

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b { font-weight: normal; }

Typed Datasets vs. Custom Classes

econner2-Aug-06 8:13

econner

2-Aug-06 8:13

I am looking for suggestions/pros/cons of using typed datasets vs. custom classes for my DAL/BLL.

Anyone have any thoughts on eXpress Persistance Objects from DevExpress or dOOdads from MyGeneration software?

Any other solutions?

Re: Typed Datasets vs. Custom Classes

eggsovereasy2-Aug-06 9:59

eggsovereasy

2-Aug-06 9:59

Use both! Make the typed Datasets the DAL and some classes the BLL. Your presentation layer then makes calls to the BLL wich in turn makes a call to the typed datasets.

If you use the System.ComponentModel.DataObject and System.ComponentModel.DataObjectMethodAttribute attributes in your BLL then you can even use your classes as datasources for gridviews et al.

I do it this way because the database people make me do things I don't like to do, like a switch in the database has to be a char(1) with 'Y' or 'N' in it instead of a bit field, so I use the BLL to abstract it so I can just use bools in my code.

private char isActive;

public bool IsActive
{
    get { return this.isActive == 'Y' ? true : false; }
    set { this.isActive = value ? 'Y' : 'N'; }
}

DAL/BLL Best Practices

econner2-Aug-06 8:08

econner

2-Aug-06 8:08

I am looking to create an Data Access Layer and Business Logic Layer for a new web site. I am looking for suggestions on the best practice on how to handle the database connection from the DAL.

I have seen examples where every function in the DAL creates a connection, runs the query, and then closes the connection based on the connection string passed into the DAL. With connection pooling this doesnt seem to be a big issue. Is this the best method for a web application since it is stateless? Or, is it better for the BLL to create a connection and pass the connection into the DAL? How is the best way to get the connection string from the Web.config file to the DAL? Does the BLL pass the connection string into the DAL or is there a better way?

I am looking at using ASP 2.0 but I didnt want to use the table adapter wizard.

Any examples would be greatly appreciated.

Re: DAL/BLL Best Practices [modified]

eggsovereasy2-Aug-06 10:03

eggsovereasy

2-Aug-06 10:03

All I can say is what I do... I keep ALL connection/database/sql out of the BLL. This way if my application moves to a different database all I have to do is rewrite the DAL and the rest of your application works fine. I also only use the presentation layer to do presentation; the BLL is what messes with the data.

Re: DAL/BLL Best Practices

econner2-Aug-06 10:12

econner

2-Aug-06 10:12

Do you have each function in the DAL also handle the connection?

How do you recommend the best way to have the DAL get the connection string?

Re: DAL/BLL Best Practices

eggsovereasy2-Aug-06 10:35

eggsovereasy

2-Aug-06 10:35

Recently I've been using typed datasets, I think they open a connection each time. In my older projects I did open a connection for each request. However, my apps are internal workflow applications though, so they are not serving 100,000 hits /sec or anything :p

I put the connection string in app.config.

How to assign text control's value to a numeric variable?

Amol Ravatale2-Aug-06 7:54

Amol Ravatale

2-Aug-06 7:54

Hi All,

How can I assign a Text control's Text value to a numeric datatype.

If I do like this
double temp = Text1.Text gives compile time error.

In case if I cast as follows
double temp=(double) Text1.Text gives run time error as
invalid cast.

Some body had suggested me to use TryParse() ot Parse method of numeric data type.
But I do see any method for numeric data type namely TryParse() or Parse().
I have .NET Framework 1.1 and VS 2003.

Regards,
Amol

Every thing will come to you if you have faith.

Re: How to assign text control's value to a numeric variable?

Stefan Troschuetz2-Aug-06 8:34

Stefan Troschuetz

2-Aug-06 8:34

In Framework 1.1 there's no TryParse but a Parse method.

double temp = Double.Parse(Text1.Text);

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Re: How to assign text control's value to a numeric variable?

engsrini2-Aug-06 8:35

engsrini

2-Aug-06 8:35

try
Convert.ToDouble(str); method

Re: How to assign text control's value to a numeric variable?

BlackDice2-Aug-06 8:38

BlackDice

2-Aug-06 8:38

double.Parse(Text1.Text)

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BlackDice

Strange Behavior

Mehdi Mousavi2-Aug-06 5:43

Mehdi Mousavi

2-Aug-06 5:43

Hi folks,
I've create a UserControl that could return a property of type
AddressCollection - a collection of Address classes (derived from
CollectionBase). I've also created an AddressTypeConverter that's being
derived from TypeConverter as well as an AddressCollectionEditor that's
being derived from CollectionEditor as follows:

////////////////////////////////////////AddressCollectionEditor<br />
    public class AddressCollectionEditor : CollectionEditor<br />
    {<br />
        public AddressCollectionEditor(Type type)<br />
            : base(type){}<br />
<br />
        protected override bool CanSelectMultipleInstances(){return<br />
false;}<br />
<br />
        protected override Type CreateCollectionItemType(){return<br />
typeof(Address);}<br />
    }<br />
<br />
////////////////////////////////////////AddressTypeConverter<br />
[Serializable]<br />
    public class AddressTypeConverter : TypeConverter<br />
    {<br />
        public override bool CanConvertTo(ITypeDescriptorContext<br />
context, Type destinationType)<br />
        {<br />
            if (destinationType == typeof(InstanceDescriptor))<br />
                return true;<br />
<br />
            return base.CanConvertTo(context, destinationType);<br />
        }<br />
<br />
        public override object ConvertTo(ITypeDescriptorContext<br />
context, System.Globalization.CultureInfo culture, object value, Type<br />
destinationType)<br />
        {<br />
            if (destinationType == typeof(InstanceDescriptor))<br />
            {<br />
                Address addr = value as Address;<br />
                if (addr == null)<br />
                    return new<br />
InstanceDescriptor(typeof(Address).GetConstructor(System.Type.EmptyTypes),<br />
null);<br />
<br />
                return new<br />
InstanceDescriptor(typeof(Address).GetConstructor(new Type[] {<br />
typeof(string), typeof(string), typeof(string), typeof(string),<br />
typeof(string), typeof(string), typeof(string) }),<br />
<br />
     new string[] { addr.Type, addr.Street1, addr.Street2, addr.City,<br />
addr.StateProvince, addr.ZipPostalCode, addr.CountryRegion });<br />
            }<br />
<br />
            return base.ConvertTo(context, culture, value,<br />
destinationType);<br />
        }<br />
    }<br />
<br />
////////////////////////////////////////AddressCtrl<br />
public partial class AddressCtrl : UserControl<br />
{<br />
  //removed for clarity....<br />
<br />
        [Category("Misc"), Description("Get a collection of<br />
addresses.")]<br />
        [Editor(typeof(AddressCollectionEditor), typeof(UITypeEditor))]<br />
<br />
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]<br />
        public AddressCollection Addresses<br />
        {<br />
            get { return m_coll; }<br />
        }<br />
<br />
}<br />
<br />
////////////////////////////////////////Address<br />
    [Serializable]<br />
    [TypeConverter(typeof(AddressTypeConverter))]<br />
    public class Address : ICloneable<br />
    {<br />
         //removed for clarity....<br />
<br />
        private string m_strType;<br />
        private string m_strStreet1, m_strStreet2;<br />
        private string m_strCity, m_strStateProvince;<br />
        private string m_strZipPostalCode, m_strCountryRegion;<br />
<br />
        public Address()<br />
            : this("Unknown", string.Empty, string.Empty, string.Empty,<br />
string.Empty, string.Empty, string.Empty)<br />
        {<br />
        }<br />
<br />
        public Address(string strType, string strStreet1, string<br />
strStreet2, string strCity, string strStateProvince, string<br />
strZipPostalCode, string strCountryRegion)<br />
        {<br />
        }<br />
<br />
         //All the member variables are exposed to the outer world<br />
through some<br />
         //accessors (get/set)....<br />
    }

Everything works fine and the following code is generated in the
InitializeComponent:

<br />
this.addressCtrl1.Addresses.AddRange(new Address[] {<br />
            new Address("Business", "", "", "", "", "", ""),<br />
            new Address("Home", "", "", "", "", "", ""),<br />
            new Address("Shipping", "", "", "", "", "", ""),<br />
            new Address("Billing", "", "", "", "", "", "")});<br />

However, when I try to remove a given item, the InitializeComponent
looks like this:

<br />
this.addressCtrl1.Addresses.AddRange(new Address[] {<br />
            ((Address)(new Address())),<br />
            ((Address)(new Address())),<br />
            ((Address)(new Address())),<br />
            ((Address)(new Address()))});<br />

Would you please let me know what I'm doing wrong?

Thank you for your time,
Mehdi

Mehdi Mousavi - Software Architect [ http://mehdi.biz ]

Screenshots

Kovu172-Aug-06 5:08

Kovu17

2-Aug-06 5:08

hi,

have anybody a link or something for creating a code that do a screenshot on click?!

Re: Screenshots

Judah Gabriel Himango2-Aug-06 5:24

Judah Gabriel Himango

2-Aug-06 5:24

There are several articles on this site the demonstrate how to do precisely that.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Messianic Instrumentals (with audio)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Re: Screenshots

Kovu172-Aug-06 23:22

Kovu17

2-Aug-06 23:22

Where? I Had search but nothing found

Re: Screenshots

Judah Gabriel Himango3-Aug-06 4:21

Judah Gabriel Himango

3-Aug-06 4:21

Search results 1-10 of about 15000 for thecodeproject.com[^]

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Messianic Instrumentals (with audio)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

how to create a color eyedroppper?

relsirc2-Aug-06 4:36

relsirc

2-Aug-06 4:36

How do I create an eyedroppper tool that is similar to adobe or maybe paint???

Re: how to create a color eyedroppper?

Ennis Ray Lynch, Jr.2-Aug-06 4:42

Ennis Ray Lynch, Jr.

2-Aug-06 4:42

1) Find an icon for an eye dropper
2) Override the MouseMove event on a control
3) Map the point to the control coordinates
4) Override the OnPaint event and pass the base class a fake graphics context to draw one
5) Read the pixel at the point

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

how to remove duplicate characters from a text file [modified]

vp152-Aug-06 4:35

vp15

2-Aug-06 4:35

hai all,
i have extracted the unicode and arabic characters from thousands of file and stored in a common file.
but, the characters get repeated in the common file.
how to remove the duplicate character...

----string str=(streamreader) sdr.readtoend();-------

char[] array = str.ToCharArray();

for(int i=0;i<array.length;i++)
{

int="" uc="(int)array[i];

if(uc">= 1536 && uc <=1791)
sw.WriteLine(uc.ToString()+"\t"+ new string(array,i,1));
}

Vp

-- modified at 10:38 Wednesday 2nd August, 2006

Re: how to remove duplicate characters from a text file

Ennis Ray Lynch, Jr.2-Aug-06 4:44

Ennis Ray Lynch, Jr.

2-Aug-06 4:44

Use a stream to loop through the characters a large portion at a time ( not read to end as it takes too much memory) Create a large array of booleans set to false. While looping through the file check to see if it exists and if not write it to another stream.

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

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