C# Discussion Boards - CodeProject

How do I assign a handler to a command button?

JoeRip10-Jan-07 20:15

10-Jan-07 20:15

Let's say I have a cmdButton sitting on my form. It's a generic "Cancel" button, and I want it to perform different operations depending on which of my methods showed it.

Given that, how do I assign a handler to the Click event for the button?

I'm sure this is much more simple than I'm making it, but I've tried eleventy-seven different syntaxes, and I'm not getting it.

Thanks!

Re: How do I assign a handler to a command button?

JoeRip10-Jan-07 20:20

JoeRip

10-Jan-07 20:20

Well, Joe, this is how it appears in the Designer.cs code, if you allow VS to do it:

this.tsCmdBtn.Click += new System.EventHandler(this.tsCmdBtn_Click);

Does this help?

Re: How do I assign a handler to a command button?

JoeRip10-Jan-07 20:20

JoeRip

10-Jan-07 20:20

It sure does. Thanks, Batman!

Re: How do I assign a handler to a command button?

CPallini10-Jan-07 22:22

CPallini

10-Jan-07 22:22

Hey Joe, what about Psychoanalysis?

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.

Insert a Record

mwith10-Jan-07 19:54

mwith

10-Jan-07 19:54

Hi all,

I am a beginner for C# and trying to study about ADO.NET. I wrote a simple application with a datagridview and three text boxes. I can populate data from table. Now I am trying to insert a record to a table. When I execute the following code, it is updating that table only a blank line. please can you help me to solve this problem? Or any other ways to update a record better than this?

using System;<br />
using System.Collections.Generic;<br />
using System.ComponentModel;<br />
using System.Data;<br />
using System.Drawing;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
using System.Data.SqlClient;<br />
<br />
<br />
namespace FundOrg<br />
{<br />
    public partial class frmBankDetails : Form<br />
    {<br />
<br />
        private DataSet dsBank;<br />
        private SqlDataAdapter da = new SqlDataAdapter();<br />
        SqlConnection myConnection = new SqlConnection();<br />
<br />
<br />
        private static frmBankDetails frmB = null;<br />
        public static frmBankDetails Instance()<br />
        {<br />
            if (frmB == null)<br />
            {<br />
                frmB = new frmBankDetails();<br />
            }<br />
            return frmB;<br />
<br />
        }<br />
<br />
        public frmBankDetails()<br />
        {<br />
            InitializeComponent();<br />
<br />
<br />
            <br />
<br />
            myConnection.ConnectionString = System.Configuration.ConfigurationManager.AppSettings["dbcon"];<br />
<br />
            try<br />
            {<br />
                myConnection.Open();<br />
            }<br />
            catch (SqlException E)<br />
            {<br />
                MessageBox.Show("Connection Erro : " + E.Message);<br />
            }<br />
<br />
            <br />
            SqlCommand cmd = new SqlCommand("SELECT * FROM Bank_Details", myConnection);<br />
           // BindingSource bsBank = new BindingSource();<br />
<br />
<br />
            da.SelectCommand = cmd;<br />
            dsBank=new DataSet();<br />
            da.Fill(dsBank,"Bank_Details");<br />
<br />
            <br />
            dgBankCode.DataSource = dsBank;<br />
            dgBankCode.DataMember = "Bank_Details";<br />
<br />
<br />
            dgBankCode.RowHeadersVisible = false;<br />
<br />
            dgBankCode.Columns[0].HeaderText = "Bank Code";<br />
            dgBankCode.Columns[1].Visible = false;<br />
            dgBankCode.Columns[2].Visible = false;<br />
<br />
            txtBankCode.DataBindings.Add("Text", dsBank, "Bank_Details.Bank_Code");<br />
            txtBankName.DataBindings.Add("Text", dsBank, "Bank_Details.Bank_Name");<br />
            txtAccNo.DataBindings.Add("Text", dsBank, "Bank_Details.Acc_No");<br />
            dgBankCode.ReadOnly = true;<br />
        }<br />
<br />
<br />
        public void SaveEntry()<br />
        {<br />
<br />
            <br />
            SqlCommand cmdUpdate = new SqlCommand();<br />
            cmdUpdate.CommandType = CommandType.Text;<br />
            cmdUpdate.CommandText = "INSERT INTO Bank_Details(Bank_Code,Bank_Name,Acc_No) VALUES('"+ txtBankCode.Text +"','"+ txtBankName.Text +"','"+ txtAccNo.Text +"')";<br />
            cmdUpdate.Connection = myConnection;<br />
            <br />
            cmdUpdate.ExecuteNonQuery();<br />
<br />
<br />
<br />
        }<br />
        <br />
       <br />
        <br />
<br />
      <br />
<br />
<br />
    }<br />
}<br />

And can anybody explain me, what are the good/bad coding practices with this?

Thanking you

Re: Insert a Record [modified]

~~_{lost in transition}~~ 11-Jan-07 6:54

~~_{lost in transition}~~

11-Jan-07 6:54

MySQLString = "INSERT INTO Bank_Details(Bank_Code,Bank_Name,Acc_No)" +
              "VALUES('"+ txtBankCode.Text +"','"+ txtBankName.Text +"','"+ txtAccNo.Text +"')";

SqlConnection MySqlConn = new SqlConnection(MyConnectionString);
SqlCommand    MySqlComm = new SqlCommand(MySQLString, MySqlConn);
// MySqlConn and MySqlComm refer to variable and not the DBMS
MySqlComm.Connection.Open();
MySqlComm.ExecuteNonQuery();
MySqlComm.Connection.Close();

mwith wrote:
And can anybody explain me, what are the good/bad coding practices with this?

When working with DB try your best to keep it simple.

Also, check the SQL statement if Bank_Code and Acc_No are 'int' data types then you need to convert the textboxes from string to int. i.e. Convert.ToInt32(txtBankCode.Text)
Good Luck,
Jason

-- modified at 12:01 Thursday 11th January, 2007

Programmer: A biological machine designed to convert caffeine into code. * Developer: A person who develops working systems by writing and using software.
[^]

serialize treeview [modified]

Maddie from Dartford10-Jan-07 19:23

Maddie from Dartford

10-Jan-07 19:23

Hello,

I am using the TreeView control in form application of C#.

I am having my own classes which are derived from TreeNode and i am adding the object of these classes to treeview as a node.

I want to serialize and deserialize the TreeView and i am doing it with BinaryFormatter object.

It get serialized properly but when i am loading it back it flashes an error "The constructor to deserialize an object of type 'MyTreeNode' was not found".

What else i need to add to get this done.

Thanks in advance

Gajesh
Pune(India)

-- modified at 2:17 Thursday 11th January, 2007

windows exe

raju_net181810-Jan-07 19:00

raju_net1818

10-Jan-07 19:00

hi
friends i have an windows exe file
i want to knwo whether i can run exe without .netframework installed on the system or not
if it can be done how can i embeed the required dll's to my project....
thanking u ./.
byebye

Re: windows exe

Christian Graus10-Jan-07 19:36

Christian Graus

10-Jan-07 19:36

This gets asked so often, and the answer is no. You can buy expensive frameworks that do it, but for the rest of us, we need to install .NET, that's a keo component of how it works.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Re: windows exe

ed^nrgc11-Jan-07 4:08

ed^nrgc

11-Jan-07 4:08

Sure, don't develop it in .NET Winforms. Winforms are a joke.

XML Parser in c#

aruna_koride10-Jan-07 18:22

aruna_koride

10-Jan-07 18:22

Hi, Iam trying to parse XMLdata in c#.
please see the XMl data:

<response>1000<message><mbit version="2"><share><id>29<title>up<description>up<file><id>26<name>up5454.bmp<type>allfiles<size>8910<checksum>9839B8107FF
3D117BDD67139D8318D29<chunks><chunk><id>45<checksum>9839B8107FF3D117BDD67139D8318D29

Iam using code:
XmlTextReader reader = new XmlTextReader(new StringReader(xmldata));

Exception coming while parsing due to xml declaration line.How to omit that line?Any idea?
Thanks

Re: XML Parser in c#

Christian Graus10-Jan-07 19:40

Christian Graus

10-Jan-07 19:40

<?xml version="1.0" encoding="UTF-8"?>
<response>
	<code>1000</code>
	<message>
		<mbit version="2">
			<share>
				<id>29</id>
				<title>up</title>
				<description>up</description>
				<file>
					<id>26</id>
					<name>up5454.bmp</name>
					<type>allfiles</type>
					<size>8910</size>
					<checksum>9839B8107FF3D117BDD67139D8318D29</checksum>
					<chunks>
						<chunk>
							<id>45</id>
							<checksum>9839B8107FF3D117BDD67139D8318D29</checksum>
						</chunk>
					</chunks>
				</file>
			</share>
		</mbit>
	</message>
</response>

Looks like your XML is valid. I wouldn't expect an exception because of the top item, not at all. What's the error ?

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Any One Modbus

sajid.salim.khan10-Jan-07 18:15

sajid.salim.khan

10-Jan-07 18:15

Hi All
I Am interfacing a microcontroller from C3 the protocol i choose is modbus Do any one have an idea or code about the modbus in C#

SAs

Leading Zeros in a DateTime Structure

eggie510-Jan-07 15:46

eggie5

10-Jan-07 15:46

So I have the current date in a string by doing this:

string date=DateTime.Now.ToShortDateString();

So on a single digit day/month it will show up without a leading zero. Like today for example:

1/10/2007

I was messing around with the format specifiers of toString but I cant figure out a way to get a leading zeros on single digit days. How can I do this short of some string spitting.

/\ |_ E X E GG

Re: Leading Zeros in a DateTime Structure

Scott Dorman10-Jan-07 16:33

Scott Dorman

10-Jan-07 16:33

Using the ToShortDateString is causing your problem. This call uses the Short date format specified in the "Regional and Language Options" control panel.

To have complete control over how the string is formatted, you would want to use the ToString method and pass in the format string. For your example, the call would look like this:

string date = DateTime.Now.ToString("MM'/'dd'/'yyyy");

-----------------------------
In just two days, tomorrow will be yesterday.

Re: Leading Zeros in a DateTime Structure

eggie511-Jan-07 9:50

eggie5

11-Jan-07 9:50

OK, thanks I didn't know it was that flexable!

/\ |_ E X E GG

Re: Leading Zeros in a DateTime Structure

Scott Dorman11-Jan-07 14:01

Scott Dorman

11-Jan-07 14:01

No problem. Most of the ToString methods, particulary on the DateTime and native numeric data types (int, short, etc.), take some sort of format string.

Here is the MSDN page that will give you information on all of the different formatting options available for the different data types:

http://msdn2.microsoft.com/en-us/library/fbxft59x.aspx[^]

-----------------------------
In just two days, tomorrow will be yesterday.

MDA ContestSwitchDeadlock

Nooie10-Jan-07 14:42

Nooie

10-Jan-07 14:42

This is a repost as I didn't get a reponse to my last one Frown | :-(

and I still can't get this thing to run through. Well I lie. It ran through fine once, but since then I've been getting this contextSwitchDeadlock issue, but I haven't modified the code! D'Oh! | :doh:

Anyone have any ideas?

/TH

<br />
Hi All,<br />
<br />
I'm slowing finding my way around C#.<br />
<br />
I have written an application that takes a directory, take each file in that directory and also each file in each subdirectory, and then trys to find any files with the same name<br />
<br />
(Trying to clear up all my duplicate photos  )<br />
<br />
SO I have written the code, and checked it and checked it again, it does not get caught in an infinite loop.<br />
<br />
But when I F6 the app it comes up with a ContextSwitchDeadlock MDA issue.<br />

Re: MDA ContestSwitchDeadlock

Nader Elshehabi10-Jan-07 15:00

Nader Elshehabi

10-Jan-07 15:00

My friend...
Even though I've never faced a contextSwitchDeadlock, but I think that googling[^] is a very healthy practice.

Regards

Re: MDA ContestSwitchDeadlock

Nooie10-Jan-07 15:08

Nooie

10-Jan-07 15:08

Hi Nader,

I tried that. found something about setting it to "Full Trusted" which i tried, but that did not resolve it.

Thanks for the help though!

Re: MDA ContestSwitchDeadlock

Nooie10-Jan-07 15:18

Nooie

10-Jan-07 15:18

I found this link so willtry this tonight

Harriyott Blog[^]

Big Grin | :-D

Re: MDA ContestSwitchDeadlock

Nader Elshehabi10-Jan-07 15:20

Nader Elshehabi

10-Jan-07 15:20

Though I don't like that solution, but here is a link to something that may help. Click here[^].

PS.
If you are mulithreading, then getting this exceptions means that you've done something wrong, and ifnoring it isn't quite the best thing to do.

Regards

Re: MDA ContestSwitchDeadlock

Nooie10-Jan-07 15:27

Nooie

10-Jan-07 15:27

LOL Great minds think a like Big Grin | :-D

Its not threading its quite procedural, so this should suffice.

I'll see if it blows up when I get it into production. Then it might be back to the drawing board.

/TH

Create C# dll that acts like a C++ dll

Preston McCormick10-Jan-07 13:54

Preston McCormick

10-Jan-07 13:54

There is a program calling a C++ dll named "ffisamp.dll".

The C++ code is as follows:

*****

//Simple C function that just puts something in a string
// and returns the length of that string both as the RC and as a param
// Keeping the C interface as simple as possible.

__declspec( dllexport ) int PopulateString ( char *FormsBuffer, int *BuffLen)
{
int LocalLength;
strcpy(FormsBuffer,"A Fixed string from within the C program");
*BuffLen = strlen(FormsBuffer);
LocalLength = strlen(FormsBuffer);
return LocalLength;
}

*****

I need C# code that will compile to a dll that mimics the sample dll such that no modifications will need to be made to the calling program. I need to be able to just replace the old dll with the new one.

I am most perplexed that the C++ method is not in a class. That might be that the source code is just a snippet of the whole dll's source code... since it comes from a sample, but I have the impression from the documentation that is all of it. Here is a link to the article I am working with. I am trying to communicate with an Oracle 10g form using methods to call C functions.

http://www.oracle.com/technology/products/forms/htdocs/webutil/howto_ffi.html[^]

I've tried a few things, but so far the calling application doesn't even find the function. Cry | :((

I am not familiar with C++, MFC etc... so I am sure I am missing some fundamentals.

Re: Create C# dll that acts like a C++ dll

Nader Elshehabi10-Jan-07 14:14

Nader Elshehabi

10-Jan-07 14:14

AFAIK that's not possible.
C# is managed code, while C++ is unmanaged code. Data and object marshaling in both is very different -not to mention the structure of the dll file, and the method of function exporting-.

Regards

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