What means @ before string in C#? - C# Discussion Boards

Re: Save Listview data to SQL database

CPallini21-Jan-09 23:22

CPallini

21-Jan-09 23:22

Tuntgerhuu wrote:
Help me

We all are with you. Go on, friend.
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

WCF Client is not Receving Response

Member 587250021-Jan-09 21:54

Member 5872500

21-Jan-09 21:54

Hi,

I've created WCF application, from WCF client application i'm calling service application (basically Windows Service) methods but i'm not able to receive service response there.

If I call from multi thread environment then I'm getting response, what should be done for NON-Multi threading call?

Thanks

Test string for DBnull as opposed to null?

kanchoette21-Jan-09 21:32

kanchoette

21-Jan-09 21:32

I can use String.IsNullorEmpty() to test a string for null. How can I test a string for DBnull please?

Re: Test string for DBnull as opposed to null?

SeMartens21-Jan-09 21:34

SeMartens

21-Jan-09 21:34

Hi,

you can use

<br />
if(myValue != DBNull.Value) {<br />
 ...<br />
<br />
}<br />

for the check if the value equals the value DBNull.

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Test string for DBnull as opposed to null?

SeMartens21-Jan-09 21:36

SeMartens

21-Jan-09 21:36

Just an addition, if you are using a DataReader you can call the method

<br />
 DataReader myDataReader = null;<br />
 ...<br />
 if(myDataReader.IsDBNull(...)) {<br />
   ...<br />
 }<br />

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

How to Convert Data from Tiff file to Text Format in C#

ChandrakanthGaddam21-Jan-09 21:25

ChandrakanthGaddam

21-Jan-09 21:25

Hi,

This is from Chandrakanth.

My question is How to Convert Data from Tiff file to Text Format.

Actually we are using OCR(Third Party Tool) for this conversion. But we

don't want to use that Third party tool. We do want get the data with

out using OCR. Is there any other way to get the Data from Tiff File to

Text Format.

Actually i am looking for some souce code.

Can any one give me reply for this

Thanks and Regards
Chandrakanth

Re: How to Convert Data from Tiff file to Text Format in C#

SeMartens21-Jan-09 21:29

SeMartens

21-Jan-09 21:29

Hi,

as far as I know is a Tiff File an Image file. That means that the bytes within the file just contains information about which color has the pixel at position x and y. The data itself doesn't know anything about if it is text or the picture of something.

So if you really don't want to use a third party tool, "all" you have to do is to write yourself an OCR application. Wink | ;)

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

What means @ before string in C#?

xx77abs21-Jan-09 21:22

xx77abs

21-Jan-09 21:22

Hello ! I'm new to C# and I've found in one sample from Codeproject something like this:

string temp=@"temp string blah blah";

What does that @ before string ?

Thanks

Re: What means @ before string in C#?

DaveyM6921-Jan-09 21:28

DaveyM69

21-Jan-09 21:28

It means verbatim string literal[^], so special characters don't need to be escaped.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: What means @ before string in C#?

xx77abs21-Jan-09 21:46

xx77abs

21-Jan-09 21:46

Wow, that was fast Smile | :)

Thanks, I understand now Smile | :)

How to get rid of event code

Member 88441121-Jan-09 20:40

Member 884411

21-Jan-09 20:40

If I accidentally click on a GUI element or a form in the VS Editor, it produces event code for that element, even if I don't want to handle that event. Then if I deleted that code I get an error. It's annoying and it clutters up my code.

Is there a way to get rid of this code, or somewhere I shold move it?

Thanks

James Confused | :confused:

Re: How to get rid of event code

Mycroft Holmes21-Jan-09 20:44

Mycroft Holmes

21-Jan-09 20:44

In the IDE go to the properties window, change to events view, right click the offending event and RESET.

Never underestimate the power of human stupidity
RAH

Re: How to get rid of event code [modified]

Member 88441121-Jan-09 23:49

Member 884411

21-Jan-09 23:49

Thanks for your help Mycroft, and excuse my human stupidity.

James

modified on Thursday, January 22, 2009 5:55 AM

Re: How to get rid of event code

Mycroft Holmes22-Jan-09 0:08

Mycroft Holmes

22-Jan-09 0:08

Not a problem, I only recently found that when it turns out C#/VS2008 does not automatically remove it from the designer file D'Oh! | :doh:

Never underestimate the power of human stupidity
RAH

Re: How to get rid of event code

#realJSOP22-Jan-09 0:17

#realJSOP

22-Jan-09 0:17

Yeah, that's a pain, but it was easily discovered in the error list when a compile is attempted, right?

I considered the original message to be a stupid question given the relative simplicity of the answer (all he had to do was double-click the error and it would have taken him to the offending code in the designer).

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Changing Win XP Registry via C#

Yasin7521-Jan-09 20:12

Yasin75

21-Jan-09 20:12

Hello,

I want to add a new menu item in winXP Explorer context menu (right click menu).

For example, I right click in winXP Explorer, and the "newCommand" option is shown.

Can this be done via C#?

Thanks!

Re: Changing Win XP Registry via C#

Mycroft Holmes21-Jan-09 20:46

Mycroft Holmes

21-Jan-09 20:46

Plenty of examples around clickety[^]

Never underestimate the power of human stupidity
RAH

global.aspx

santoshsavita21-Jan-09 19:48

santoshsavita

21-Jan-09 19:48

can any one help me how to implement global.aspx in c#.net.If any one knows give me the detail steps !!

Re: global.aspx

Harvey Saayman21-Jan-09 19:52

Harvey Saayman

21-Jan-09 19:52

Try The Google Machine[^]

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.Passion != Programming & you.Occupation == jobTitles.Programmer)
1000100 1101111 1100101 1110011 100000 1110100 1101000 1101001 1110011 100000 1101101 1100101 1100001 1101110 100000 1101001 1101101 100000 1100001 100000 1100111 1100101 1100101 1101011 111111

Drag and Drop Treeview Item into listview

Udayaraju21-Jan-09 19:36

Udayaraju

21-Jan-09 19:36

Hi EveryBody,

How to Drag and Drop Treeview Item into listview? Please help me out..

I have one parent node and two child nodes. when I drag a Parent Node, included child nodes are also to be dragged.
And all of them to be placed in listview row (3 columns).

Please help me out with a sample example. Itz very urgent for me Confused | :confused:

Re: Drag and Drop Treeview Item into listview

Udayaraju22-Jan-09 0:31

Udayaraju

22-Jan-09 0:31

Please reply me

Re: Drag and Drop Treeview Item into listview

DaveyM6922-Jan-09 1:51

DaveyM69

22-Jan-09 1:51

Udayaraju wrote:
Itz very urgent for me

... but not urgent for us. I saw your post hours ago but ignored it because of this. Bumping your post will not get you any further.

I won't give you the code but I'll give you the theory so you can code it yourself. If you get stuck with a specific part of your code, post it and we'll have a look.

What you want is a very simple 3 step process.

In the treeview's mousedown event , get the node at the mouse point. Set the selectednode to be that node If it's not null and is a 'Parent' node, call the treeview's DoDragDrop method.

In the listview's dragover event, set the effect property of the event arguments to copy.

In the litview's DragDrop event, convert the data to a treenode (would be a good idea to null check here too) then convert it and it's nodes (children) to a listviewitem with listviewsubitems and add to your listview.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: Drag and Drop Treeview Item into listview

Udayaraju22-Jan-09 3:01

Udayaraju

22-Jan-09 3:01

Hi,

Thanq for ur Suggestion But i tried inthes way..can you corect the problem here.

See the below code. Here I have a Problem. Treeview has already one root node and twochild nodes with it.
They have to be dragged and dropped in listview.

The main Problem is wen I drag an item..the Itemdrag event is not fired.?? Please try to resolve it.

private void tvwSalesProducts_ItemDrag(object sender, ItemDragEventArgs e)
{
tvwSalesProducts.DoDragDrop(e.Item, DragDropEffects.Copy | DragDropEffects.Move);
}

private void lstMultiProItems_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy | DragDropEffects.Move;
}

private void lstMultiProItems_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false))
{
string[] Items = new string[5];
TreeNode SourceNode;
SourceNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");
Items[0] = Convert.ToString(SourceNode.Tag);
Items[1] = SourceNode.Text.ToString();
Items[2] = SourceNode.FirstNode.Text.ToString();
Items[3] = SourceNode.LastNode.Text.ToString();

lstMultiProItems.Items.Clear();
lstMultiProItems.Columns.Add("ID", 100, HorizontalAlignment.Left);
lstMultiProItems.Columns.Add("Product Name", 100, HorizontalAlignment.Left);
lstMultiProItems.Columns.Add("Selling Price", 100, HorizontalAlignment.Left);
lstMultiProItems.Columns.Add("Conversion", 100, HorizontalAlignment.Left);

ListViewItem Item1 = new ListViewItem(Items);
lstMultiProItems.Items.Add(Item1);
lstMultiProItems.AllowColumnReorder = false;
lstMultiProItems.FullRowSelect = true;
}
}

Re: Drag and Drop Treeview Item into listview

DaveyM6922-Jan-09 4:07

DaveyM69

22-Jan-09 4:07

Check out the working code below and compare - you should be able to figure it out from this.

/* Assumes
TreeView treeView1. Parent node must have Tag "Parent" and
exactly two child nodes for drag to work
ListView listView1 with three columns already added.

Events subscribed
treeView1.ItemDrag += new ItemDragEventHandler(treeView1_ItemDrag);
listView1.DragOver += new DragEventHandler(listView1_DragOver);
listView1.DragDrop += new DragEventHandler(listView1_DragDrop);
*/
void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
{
    TreeNode nodeData = (TreeNode)e.Item;
    // set as selected
    treeView1.SelectedNode = nodeData;
    // check is parent using tag property
    if ((string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
        // OK
        treeView1.DoDragDrop(nodeData, DragDropEffects.Copy);
}
void listView1_DragOver(object sender, DragEventArgs e)
{
    // default to none
    e.Effect = DragDropEffects.None;
    // get tree node
    TreeNode nodeData = (TreeNode)e.Data.GetData(typeof(TreeNode));
    // check data in case coming from elsewhere
    if (nodeData != null && (string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
        // OK so proceed
        e.Effect = DragDropEffects.Copy;

}
void listView1_DragDrop(object sender, DragEventArgs e)
{
    // get tree node
    TreeNode nodeData = (TreeNode)e.Data.GetData(typeof(TreeNode));
    // check data
    if (nodeData != null && (string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
    {
        // convert
        ListViewItem newItem = new ListViewItem(nodeData.Text);
        foreach (TreeNode childNode in nodeData.Nodes)
        {
            ListViewItem.ListViewSubItem newSub = new ListViewItem.ListViewSubItem();
            newSub.Text = childNode.Text;
            // add children to parent
            newItem.SubItems.Add(newSub);
        }
        // add parent
        listView1.Items.Add(newItem);
    }
}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: Drag and Drop Treeview Item into listview

Udayaraju22-Jan-09 4:14

Udayaraju

22-Jan-09 4:14

Thanq very mUch Dave..... these may help me a Lot.

I wil go through It and cum with u New errors..
Jus Kidding Thumbs Up | :thumbsup:

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