Re: problem with propertygrid - C# Discussion Boards

how to get present item from generic list using c#

10-Dec-07 1:39

thanks that sorted it cheers

ramyanaidu9-Dec-07 23:59

ramyanaidu

9-Dec-07 23:59

Hai i am doing program using list i need to add item to list using first,next,last buttons contioniously when i press previous button it should display the previous item in the list plz any on help me in this case

Re: how to get present item from generic list using c#

Anthony Mushrow10-Dec-07 0:09

Anthony Mushrow

10-Dec-07 0:09

well.. the last item in the list will be the total number of items... -1 OMG | :OMG:

Actually, -2, since arrays always start at 0.
Then after that everytime you click previous you go one lower. So you'd have to have some variable for the current item your looking at.

My current favourite word is: Bauble!

-SK Genius

Re: how to get present item from generic list using c#

CKnig10-Dec-07 0:58

updates on stored procedure does not appear on dataset

10-Dec-07 0:58

You can use the LinkedList( Of T) or use the index (like the other poster mentioned) ... it's not that hard Wink | ;)

subai9-Dec-07 23:48

subai

9-Dec-07 23:48

hi 1-i have a detaset that filled with a sp
2-i added a column later to sp
3-i go to dataset designer and tried to configure it
4-the new column does not exists in dataset column list
5-i check the connection string , i ran sp from server explorer and management studio 2005 both worked, i refresh my solution refresh my server explorer,reboot my compter, i taked deep breathes,...

none of them helped , so can u help me?

I Wish the Life Had CTRL-Z

Switching Internet connections

new2pgrmg9-Dec-07 23:47

new2pgrmg

9-Dec-07 23:47

Hi,
I want to write a windows app that will switch my network connections.For example if i have three service providers and if the one i am using now goes down i can switch to the other on a button click.
i plan to keep three buttons and on the buttonclick of these plan to change the connections.ie button1 will connect met to one particular providers internet connection and hence forth regarding the other buttons.I am stuck till here .i think from here i need help.how can i make the computer to switch between the connections?Can any body give me any suggestions or links regarding this?

Thanking You

problem with propertygrid

Deglimmer9-Dec-07 23:43

Deglimmer

9-Dec-07 23:43

Hi,

im using propertygrid and trying to show boolean property with other string values than true/false,
i made boolenconverter for this, it works fine when i use combobox to change value, but i get inner propertygrid error when i doubleclick to change value in propertygrid:

Invalid property value!
Details: Cannot widen from target type to primitive type.

<br />
public class BaseProps{<br />
<br />
	private bool test;<br />
<br />
	[TypeConverter(typeof(BoolNameConverter2))]<br />
	public bool Value {<br />
		get {return test;}<br />
		set {test = value;}<br />
	}<br />
<br />
}<br />
<br />
<br />
public class BoolNameConverter2 : StringConverter<br />
{<br />
<br />
	private const string m_trueDisplayName = "on";<br />
	private const string m_falseDisplayName = "off";<br />
<br />
	public override bool CanConvertTo(ITypeDescriptorContext context,<br />
		System.Type destinationType) <br />
	{<br />
		if (destinationType == typeof(bool))<br />
			return true;<br />
			<br />
		return base.CanConvertTo(context, destinationType);<br />
	}<br />
<br />
	public override object ConvertTo(ITypeDescriptorContext context,<br />
		CultureInfo culture, <br />
		object value, <br />
		System.Type destinationType) <br />
	{<br />
		if (value is bool && destinationType == typeof(System.String)) {<br />
			return (bool)value ? m_trueDisplayName : m_falseDisplayName;<br />
		}<br />
		return base.ConvertTo(context, culture, value, destinationType);<br />
	}<br />
<br />
	public override bool CanConvertFrom(ITypeDescriptorContext context,<br />
		System.Type sourceType) <br />
	{<br />
		if (sourceType == typeof(string))<br />
			return true;<br />
			<br />
		return base.CanConvertFrom(context, sourceType);<br />
	}<br />
<br />
	public override object ConvertFrom(ITypeDescriptorContext context,<br />
		CultureInfo culture, object value) <br />
	{<br />
		if (value is string) {<br />
			return (string)value == m_trueDisplayName ? true : false;<br />
		}  <br />
		return base.ConvertFrom(context, culture, value);<br />
	}<br />
<br />
	public override bool GetStandardValuesSupported(<br />
		ITypeDescriptorContext context) <br />
	{<br />
		return true;<br />
	}<br />
<br />
	public override StandardValuesCollection<br />
		GetStandardValues(ITypeDescriptorContext context) <br />
	{<br />
		return new StandardValuesCollection (new string[]{m_trueDisplayName, m_falseDisplayName});<br />
	} <br />
<br />
	public override bool GetStandardValuesExclusive(<br />
		ITypeDescriptorContext context) <br />
	{<br />
		return true;<br />
	}<br />
<br />
}<br />
<br />

What could be the problem? Has anybody had similar problem and has solution? How to fix it?
Thanks

Deglimmer

Re: problem with propertygrid

visualhint13-Dec-07 11:36

visualhint

13-Dec-07 11:36

Hi,

Your converter should derive from BooleanConverter. Just override the ConvertTo and ConvertFrom methods to change the display strings.

Best regards,

Nicolas Cadilhac @ VisualHint
Smart PropertyGrid.Net
Microsoft PropertyGrid Resource List
Free PropertyGrid for MFC
Smart FieldPackEditor.Net / DateTimePicker

problem to load Data from form2 to form1.gridView

hdv2129-Dec-07 23:32

hdv212

9-Dec-07 23:32

hi in my app, i have two forms, in form1, i have a button and gridview and a public method as 'LoadData' as follow :

public void LoadData()<br />
        {<br />
            using (SqlConnection con = new SqlConnection("Data Source=server;Initial Catalog=northwind;User Id=sa;Password=1;"))<br />
            {<br />
                SqlCommand cmd = new SqlCommand("select * from customers", con);<br />
                SqlDataReader dr;<br />
                DataTable dt = new DataTable();<br />
                con.Open();<br />
                dr = cmd.ExecuteReader();<br />
                dt.Load(dr);<br />
                con.Close();<br />
                this.gridControl1.DataSource = dt.DefaultView;<br />
            }<br />
        }

in button_click event, i show form2 as follow :

private void simpleButton1_Click(object sender, EventArgs e)<br />
        {   <br />
            Form2 frm = new Form2();<br />
            frm.Show();<br />
        }

in form2, i have only one button, i want when i click this button, create object from form1 and calling LoadData() method to fill gridView as follow :

private void simpleButton1_Click(object sender, EventArgs e)<br />
        {<br />
            Form1 frm = new Form1();<br />
            frm.LoadData();<br />
        }

but in runTime, when i click button in form2, gridView does not fill, i trace my app and i saw frm.LoadData() was correctly work but gridView does not fill, where does my problem and how to solve it ?
thanks

Re: problem to load Data from form2 to form1.gridView

CKnig10-Dec-07 1:10

Re: problem to load Data from form2 to form1.gridView

10-Dec-07 1:10

So you have: Form1 with Button 1 and Form2 with Button 2 - if you klick Button 1, a new Form2 window should appear and if you then click on Button 2 in it, the first form (Form1) shall Load the data right?

Ok you will have to do something like this:

in Form2 declare a public function SetForm1 - that sets an internal variable to an object of Form1, then in the first button click use:

<br />
Form2 frm = new Form2();<br />
frm.SetForm1(this);<br />
frm.Show();<br />

and in Buttonclick of Form2:

<br />
_form1Var.LoadData();<br />

The problem is simple: in your code you create a new Form1 object (that you will never see - you never use it's Show-method) and fire LoadData against this!

Bye the way: you should not interweave two forms in such a way - use events of public functions for such tasks.

hdv21210-Dec-07 2:50

hdv212

10-Dec-07 2:50

thanks for reply,
my problem was solved.
regards

Re: problem to load Data from form2 to form1.gridView

CKnig10-Dec-07 2:56

10-Dec-07 2:56

<br />
<br />
private Form1 _form1;<br />
public void SetForm1(Form1 obj)<br />
{ _form1 = obj; }<br />
<br />

Then you can use
_form1.LoadData()
inside your Button_Click - event

checking for a _

eyeseetee9-Dec-07 23:07

9-Dec-07 23:07

Hi
I need to write an IF statement which checks if a session contains a _
how would i go about doing this
thanks

Re: checking for a _

Bekjong9-Dec-07 23:24

Bekjong

9-Dec-07 23:24

Please don't post questions twice, your last post comes down to the same question and I answered it there.

Standards are great! Everybody should have one!

Re: checking for a _

eyeseetee9-Dec-07 23:52

9-Dec-07 23:52

cheers

DOM in C#

Yoyosch9-Dec-07 22:45

Yoyosch

9-Dec-07 22:45

How to get the number of all elements in XML file using DOM?

checking for a value

eyeseetee9-Dec-07 22:40

9-Dec-07 22:40

Hi
I have the following code which checks what the last number is in a database field after the _ and then adds 1 to it. however i need to add an extra bit of code in to check if a number exisits there already as the field could be: xxxx~xxx_01 or it could just be xxxx~xxx without the underscore. if its the latter then it will need to start from 1 and incrment up from there adding an underscore to the field where as at the moment it checks if there is a 1 there already,
any suggestions?
hope this makes sense, comment if not

cheers

SqlCommand cmd17 = new SqlCommand(test0002, con2);

StringBuilder htmlStr_room_code2 = new StringBuilder("");

SqlDataReader reader2 = cmd17.ExecuteReader();

while (reader2.Read())
{
htmlStr_room_code2.Append(reader2["room_code"]);
}

lbtest2.Text = htmlStr_room_code2.ToString();
Session["sessiontest1"] = lbtest2.Text.ToString();

string db = Session["sessiontest1"].ToString(); // "jh00~pr11_01";
string[] split = db.Split('_');

string s_number = split[1];
int i_number = Int32.Parse(s_number);

i_number++;
s_number = i_number.ToString();

db = split[0] + "_" + s_number;

Re: checking for a value

Bekjong9-Dec-07 23:22

Bekjong

9-Dec-07 23:22

Once you have your db string you can use if(db.Contains("_")) and go from there.

Standards are great! Everybody should have one!

C#.NET windows services

D i x y9-Dec-07 22:39

D i x y

9-Dec-07 22:39

I am developing an windows application and i want that when system starts application automatically run.
I know that may be done by using windows services but i am unable to do that.......
So please help

Bekjong9-Dec-07 23:31

Bekjong

9-Dec-07 23:31

The answer's on the first page I got when searching on
Google[^] :S.

Standards are great! Everybody should have one!

Ujjaval Modi10-Dec-07 0:13

Ujjaval Modi

10-Dec-07 0:13

Simply see the following article on codeproject

http://www.codeproject.com/KB/dotnet/simplewindowsservice.aspx[^]

Regards,

Ujjaval Modi Smile | :)

Manpower moves wrenches, horsepower moves cars, and the power of the mind moves the world.

CKnig10-Dec-07 0:31

10-Dec-07 0:31

as you've got answers concering windwos services:

I don't think you want to write a service-app. (services shouldn't use GUIs! - aka forms etc.) - you just want to start the app on starup? - Well put a link into your autostart (startup whatever) - folder in your start-menu!