Re: set enter key instead of tab key - C# Discussion Boards

Re: Windows XP SP2 : The Death of my Chatting Application?

sreejith ss nair3-Nov-04 20:22

3-Nov-04 20:22

The reason may cause of security and firewall features avilable in XP SP2. What you can do is find out proper restriction areas where your client communicate with your requested machine.

And i recommand you to read more about Features and Techinical Overviews of SP2.
Learn About SP2
Techinological Overview This will give you some more ideas.
Techinical Look At SP2

Sreejith Nair
[ My Articles ]

Re: Windows XP SP2 : The Death of my Chatting Application?

Zishan Haider4-Nov-04 17:57

Zishan Haider

4-Nov-04 17:57

Thanks for the reply.. yes it started working.. nice articles..

Regards,
Zishan

set enter key instead of tab key

amalatsliit3-Nov-04 18:57

amalatsliit

3-Nov-04 18:57

In my customer form there are few text box's for enter Data.i have set up sequence of tab no's for those text box's.What i want is to move cusor from
text field 1 to text field 2 by pressing Enter Key.

How can i do this by using c#.

Can any one Please Help me.

Amal Confused | :confused:

Re: set enter key instead of tab key

DanieVanEck3-Nov-04 19:36

DanieVanEck

3-Nov-04 19:36

Place the following code in textbox1's keydown event. Repeat for all other textboxes accordingly.

private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
textBox2.Focus();
}

Re: set enter key instead of tab key

DanieVanEck3-Nov-04 19:41

DanieVanEck

3-Nov-04 19:41

Here is a better solution. Place this code in a common keydown event between all the textboxes. Then set the taborder of the textboxes in the order that they sould be focussed.

private void textBox1_KeyDown_1(object sender, System.Windows.Forms.KeyEventArgs e)
{
int i = ((TextBox)sender).TabIndex;
if (e.KeyCode == Keys.Enter)
{
foreach (Control c in this.Controls)
{
if (c is TextBox)
{
if (((TextBox)c).TabIndex == i + 1)
{
c.Focus();
}
}
}
}
}

Re: set enter key instead of tab key

sreejith ss nair3-Nov-04 19:50

sreejith ss nair

3-Nov-04 19:50

To set and view the Tab order, On the View menu, choose Tab Order which is avilable in .NET IDE.

to select control using enter key, use below mentioned code block.

private void Form1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)<br />
{<br />
			<br />
if(e.KeyValue==13)<br />
{<br />
				this.SelectNextControl(this.ActiveControl,true,true,false,true);<br />
}<br />
			<br />
}

The above code block is only tip to achive your requirement.
Please see more details on SelectNextControl Method for different style of selection and parameter types in MSDN.
Big Grin | :-D

Sreejith Nair
[ My Articles ]

Re: set enter key instead of tab key

Jay Shankar4-Nov-04 15:03

Jay Shankar

4-Nov-04 15:03

Sreejith, Sorry for the interruption in between. I doubt whether Form's KeyDown event will get fired, If textBox has the focus.

I feel, It would not solve the purpose. You should call the SelectNextControl method in the KeyDown Or KeyUp event of the textbox.

Re: set enter key instead of tab key

amalatsliit10-Mar-05 18:08

amalatsliit

10-Mar-05 18:08

Dear friens,
Above problem working with windows forms.but my problem is how do we apply above things in webforms.cas in asp.net ,textbox don't have focus property right.

How we set enter key operations on asp.net.

Thanks

help with a new control

tom_dx3-Nov-04 16:03

tom_dx

3-Nov-04 16:03

does any one know how to make a grand staff since i think i would have to use gdi+ since .net doesn't support making custom controls, any ideas on how to start though?

IM PROUD TO BE A GMAIL;

Re: help with a new control

sreejith ss nair3-Nov-04 16:55

sreejith ss nair

3-Nov-04 16:55

You Wrote:
does any one know how to make a grand staff
What sort of control that you are looking for ?

Sreejith Nair
[ My Articles ]

Re: help with a new control

Dave Kreskowiak3-Nov-04 17:18

Dave Kreskowiak

3-Nov-04 17:18

tom_dx wrote:
make a grand staff

What's a "grand staff"?

tom_dx wrote:
since .net doesn't support making custom controls

What do you think is limiting you?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: help with a new control

Roger Alsing4-Nov-04 2:26

Roger Alsing

4-Nov-04 2:26

DOH!!! , obviously he needs a "Lesser Staff" to inherit from D'Oh! | :doh:

and that is missing in .NET Poke tongue | ;-P

//Roger

Re: help with a new control

Dave Kreskowiak4-Nov-04 6:23

Dave Kreskowiak

4-Nov-04 6:23

Another thing I missed when reading the .NET Framework SDK! Poke tongue | ;-P

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Best Practice For .NET Service

SigEpUCI3-Nov-04 15:07

SigEpUCI

3-Nov-04 15:07

Hi,

I wrote a .NET Windows service that spawns a thread which periodically performs some DB related work. When the service starts, it spawns the thread, when the service stops, it aborts the thread.

The thread sleeps for 30 seconds, then wakes ups and querys some DB values, then sleeps again in an infinite loop.

A friend suggested that I Use a timer instead of a sleeping thread, and I could not think of an explicit reason why each approach is better. What approach would you take and why?

Thanks,
Jeff

Re: Best Practice For .NET Service

sreejith ss nair3-Nov-04 16:59

sreejith ss nair

3-Nov-04 16:59

I will always prefer Thread.Sleep(xxxx).
We have facility to make the thread sleep for required seconds. Then why shold i use timer here.

Sreejith Nair
[ My Articles ]

Re: Best Practice For .NET Service

Dave Kreskowiak3-Nov-04 17:17

Dave Kreskowiak

3-Nov-04 17:17

Because, IIRC, a Sleeping thread won't respond to ANYTHING until it wakes up again. Do you want to wait 30 seconds for the thread to abort, or the service to stop, or its interface to respond, or ... ?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Best Practice For .NET Service

Sebastian Schneider4-Nov-04 22:40

Sebastian Schneider

4-Nov-04 22:40

Exactly.

You cannot wake up a sleeping thread prematurely, so you have to wait for the thread to wake up before you can abort the thread etc.

If you used a timer, you could fire your processing method every 30 seconds and still be able to "fire" it in between conditionally.

e.g. Admin connecting to service, requesting another db-op on the same db with non-standard commands etc.

parsing

webhay3-Nov-04 14:17

webhay

3-Nov-04 14:17

hello all

i do this code in db but parse give me this erro "input string not in the correct format" When i leave the field parsed blank (textBox2.text)

"Insert INTO test (Name,age,address) Values('"+textBox1.Text+"','"+decimal.Parse(textBox2.Text)+"','"+textBox3.Text+"

Regards
haytham

Re: parsing

Dave Kreskowiak3-Nov-04 17:14

Dave Kreskowiak

3-Nov-04 17:14

This is what I mean by string concantenation. Don't EVER do this! Use parameterized queries instead. What you doing now results in goofy error you have trouble nailing down and also REALLY opens your code up for SQL injection attacks. For examples, check out the SqlParameter class[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: parsing

Charlie Williams3-Nov-04 17:15

Charlie Williams

3-Nov-04 17:15

The Decimal type can't parse an empty string. It's as invalid a decimal as "Frank" is.

Either make sure you're only dealing with valid values in the TextBox before you parse it or catch the FormatException that will be thrown otherwise. You'll get better performance validating the input, though.

By the way, when Dave Kreskowiak asked you about using string concatenation to build your SQL statement a few posts down, this is what he meant.

A much better way is to use parameters in your query. The exact syntax varies from provider to provider, but here's an example:

// Create the command with place-holders for the parameters
OleDbCommand command = new OleDbCommand("Insert INTO test (Name,age,address) Values(?, ?, ?)");
  
// _name, _age, and _address are variables of the appropriate type that are defined
// and validated elsewhere.  I don't add them straight from 
// the TextBoxes because I don't want junk in my database.
command.Parameters.Add(new OleDbParameter("Name", _name));
command.Parameters.Add(new OleDbParameter("Age", _age));
command.Parameters.Add(new OleDbParameter("Address", _address));

Charlie

if(!curlies){ return; }

Re: parsing

webhay4-Nov-04 1:03

webhay

4-Nov-04 1:03

Hello Charlie,

Thanks for your help...

i try this code but give the same error

SqlConnection cnn    = new SqlConnection();<br />
			cnn.ConnectionString = "workstation id=SERVER;packet size=4096;integrated security=SSPI;data source=SERVER;persist security info=True;initial catalog=TestDB";<br />
SqlCommand  cmd       = new SqlCommand("Insert INTO test (Name,age,address) Values(@Name,@age,@address)");<br />
			//cmd.CommandType      = CommandType.Text;<br />
			<br />
			cmd.Parameters.Add(new SqlParameter("@Name",SqlDbType.VarChar));<br />
			cmd.Parameters["@Name"].Value = textBox1.Text;<br />
<br />
			cmd.Parameters.Add(new SqlParameter("@age",SqlDbType.Decimal));<br />
			cmd.Parameters["@age"].Value = decimal.Parse(textBox2.Text.Trim());<br />
<br />
			cmd.Parameters.Add(new SqlParameter("@address",SqlDbType.VarChar));<br />
			cmd.Parameters["@address"].Value = textBox3.Text;<br />
	<br />
			<br />
			<br />
			//cmd.CommandText  = "Insert INTO test (Name,age,address) Values(@Name,@age,@address)";<br />
			cnn.Open();<br />
			cmd.ExecuteNonQuery();<br />
			cnn.Close();

please help

Thanks

Re: parsing

webhay4-Nov-04 1:03

webhay

4-Nov-04 1:03

Hello Charlie,

Thanks for your help...

i try this code but give the same error

SqlConnection cnn    = new SqlConnection();<br />
			cnn.ConnectionString = "workstation id=SERVER;packet size=4096;integrated security=SSPI;data source=SERVER;persist security info=True;initial catalog=TestDB";<br />
SqlCommand  cmd       = new SqlCommand("Insert INTO test (Name,age,address) Values(@Name,@age,@address)");<br />
			//cmd.CommandType      = CommandType.Text;<br />
			<br />
			cmd.Parameters.Add(new SqlParameter("@Name",SqlDbType.VarChar));<br />
			cmd.Parameters["@Name"].Value = textBox1.Text;<br />
<br />
			cmd.Parameters.Add(new SqlParameter("@age",SqlDbType.Decimal));<br />
			cmd.Parameters["@age"].Value = decimal.Parse(textBox2.Text.Trim());<br />
<br />
			cmd.Parameters.Add(new SqlParameter("@address",SqlDbType.VarChar));<br />
			cmd.Parameters["@address"].Value = textBox3.Text;<br />
	<br />
			<br />
			<br />
			//cmd.CommandText  = "Insert INTO test (Name,age,address) Values(@Name,@age,@address)";<br />
			cnn.Open();<br />
			cmd.ExecuteNonQuery();<br />
			cnn.Close();

please help

Thanks

Re: parsing

J4amieC4-Nov-04 2:54

J4amieC

4-Nov-04 2:54

you still have the same error in your code:

decimal.Parse(textBox2.Text.Trim());

decimal.Parse will throw a FormatException when the parameter is a blank string. Test for a blank string before the call to this method.

Re: parsing

webhay4-Nov-04 3:17

webhay

4-Nov-04 3:17

ok but i need to make some fields require and some fields not require the problem in the fields that not require when the user will leave it blank

how can i solve this problem

regards
Hay

file reading and access database

aquahawk3-Nov-04 11:36

aquahawk

3-Nov-04 11:36

what i want to do is read some information from a text file straight into an access database
but i cant find any examples can anyone help with
some code or a site with that information
thx

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