Nested Datalist Selection sometimes fails when large data or clicking to fast -- Guessing Timeout ?? Ideas??? Going Crazy! - C# Discussion Boards

ArunJoseph 47163951-Jul-08 12:28

1-Jul-08 12:28

Is SuppressKeyPress property available in c# ?

i want to prevent user from entering any digits into a text field (anything other than digits are allowed)

so i gave the following code

void form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            
           .
            
            if (char.IsDigit(e.KeyChar ))
            {
                //MessageBox.Show("its a number");
                
                 --i want to prevent user from entering any digit--
                
                
            }
            
        }

in VB there is a propery called SuppressKeyPress in KeyEventArgs. but its not there in C# . is there any other equivalent for SuppressKeyPress in C# ?

Re: KeyEventArgs.SuppressKeyPress in C#

User 66581-Jul-08 12:36

User 6658

1-Jul-08 12:36

e.Handled = char.IsDigit(e.KeyChar )

regards

modified 12-Sep-18 21:01pm.

Re: KeyEventArgs.SuppressKeyPress in C#

ArunJoseph 47163951-Jul-08 20:51

ArunJoseph 4716395

1-Jul-08 20:51

thanks a lot..

i have one more doubt.

i need a textbox where the user can enter only

Alphabets (A-Z and a-z)
Space
and also allow them to use backspace and delete keys.

this is the code i tried

if (!((e.KeyChar >= 'A' && (e.KeyChar <= 'Z') || ((e.KeyChar >= 'a') && (e.KeyChar <= 'z')))))
{

    e.Handled = true;


}

if (char.IsSeparator(e.KeyChar))
{
    e.Handled = false;
}

but the above code wont allows the user to use backspace

plz help me to set e.handled = false when the key pressed by the user is a backspace so that he can erase the last character entered

Re: KeyEventArgs.SuppressKeyPress in C#

N a v a n e e t h1-Jul-08 21:02

N a v a n e e t h

1-Jul-08 21:02

This worked for me

int keycode = e.KeyChar;
if (!((e.KeyChar >= 'A' && e.KeyChar <= 'Z') || (e.KeyChar >= 'a' && e.KeyChar <= 'z') || keycode == 8 || keycode == 32)) {
     e.Handled = true;
}

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Re: KeyEventArgs.SuppressKeyPress in C#

ArunJoseph 47163951-Jul-08 22:06

ArunJoseph 4716395

1-Jul-08 22:06

hey Navaneeth...

thanks a lot.. Big Grin | :-D

i solved my problem like this

if (!((e.KeyChar >= 'A' && (e.KeyChar <= 'Z') || ((e.KeyChar >= 'a') && (e.KeyChar <= 'z')))))
     {
           e.Handled = true;
     }
     if ((char.IsWhiteSpace(e.KeyChar)) || (e.KeyChar == (char)ConsoleKey.Backspace))
     {
         e.Handled = false;
     }

but your solution is the smarter way to handle it..

I am new to codeproject.com and people like you will make this a better place for people like me to find solutions to their problems!!!

cheers!! Wink | ;)

Arun

Re: KeyEventArgs.SuppressKeyPress in C#

Luc Pattyn1-Jul-08 14:23

Luc Pattyn

1-Jul-08 14:23

Hi,

two comments:

1. it is KeyEventArgs (as given by KeyDown and KeyUp) that holds a SuppressKeyPress property

2. all .NET classes are identical in C# and VB.NET, they are language-agnostic.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: KeyEventArgs.SuppressKeyPress in C#

ArunJoseph 47163951-Jul-08 20:57

ArunJoseph 4716395

1-Jul-08 20:57

I am doing this in VC# and the object of KeyEventArgs didnt show the SuppressKeyPress.
instead the keyhit can be handled by

kKeyEventArgs e
e.Handled = true;

thnanks to Greeg !! Poke tongue | ;-P

Nested Datalist Selection sometimes fails when large data or clicking to fast -- Guessing Timeout ?? Ideas??? Going Crazy!

Natalia_Uribe1-Jul-08 11:46

Natalia_Uribe

1-Jul-08 11:46

I have a user control that has 2 nested datalists. The second datalist requieres arguments from the first one to display the data. The main one shows the Product Categories and the second one shows the products for the selected category. When the user selects an item from the first I am calling "DataList_ItemCommand" which sets a session variable and then programatically binds the data for the second datalist. SOMETIMES (Mostly when the results are big or if I click to fast) I get an error on Internet Explorer which forces me to refresh the screen to see the data... Any ideas on what could be happening? Solutions?? Thanks Guys!

public void DataList_ItemCommand(Object sender, DataListCommandEventArgs e)
{
decimal nCpPk = (decimal)CategoryList.DataKeys[e.Item.ItemIndex];
Session["CategoryId"] = nCpPk;

BindData();
}

public void BindData()
{
//Dataset
DataSet DS = new DataSet();

//Create a connection to the SQL Server.
string strConnectionString = ConfigurationManager.ConnectionStrings["EckeMasterConnectionString"].ConnectionString;
SqlConnection conn = new SqlConnection(strConnectionString);

//Session Variables
decimal tmpCategoryId = (decimal)Session["CategoryId"];
decimal tmpMainCateg = (decimal)Session["MainCateg"];
string tmpShipWeek = (string)Session["ShipWeek"];
int tmpAvailableOnly = (int)Session["AvailableOnly"];
string tmpProdForm = (string)Session["ProdForm"];

//Create a DataAdapter, and then provide the name of the stored procedure.
SqlDataAdapter MyDataAdapter1 = new SqlDataAdapter("EWO_ProductsByCategory", conn);
MyDataAdapter1.SelectCommand.CommandType = CommandType.StoredProcedure;

SqlParameter ParCateg = new SqlParameter("@CategoryId", SqlDbType.Int);
ParCateg.Value = tmpCategoryId;
MyDataAdapter1.SelectCommand.Parameters.Add(ParCateg);

SqlParameter ParMainCateg = new SqlParameter("@MainCateg", SqlDbType.Int);
ParMainCateg.Value = tmpMainCateg;
MyDataAdapter1.SelectCommand.Parameters.Add(ParMainCateg);

SqlParameter ParProdForm = new SqlParameter("@ProdForm", SqlDbType.Int);
ParProdForm.Value = tmpProdForm;
MyDataAdapter1.SelectCommand.Parameters.Add(ParProdForm);

MyDataAdapter1.SelectCommand.CommandTimeout = int.MaxValue;
MyDataAdapter1.Fill(DS, "Products");

//'Create a DataAdapter, and then provide the name of the stored procedure.
SqlDataAdapter MyDataAdapter2 = new SqlDataAdapter("EWO_ProductDetail", conn);
MyDataAdapter2.SelectCommand.CommandType = CommandType.StoredProcedure;

SqlParameter ParCategA = new SqlParameter("@CategoryId", SqlDbType.Int);
ParCategA.Value = tmpCategoryId;
MyDataAdapter2.SelectCommand.Parameters.Add(ParCategA);

SqlParameter ParMainCategA = new SqlParameter("@MainCateg", SqlDbType.Int);
ParMainCategA.Value = tmpMainCateg;
MyDataAdapter2.SelectCommand.Parameters.Add(ParMainCategA);

SqlParameter ParShipWeekA = new SqlParameter("@ShipWeek", SqlDbType.DateTime);
ParShipWeekA.Value = tmpShipWeek;
MyDataAdapter2.SelectCommand.Parameters.Add(ParShipWeekA);

SqlParameter ParAvailOnlyA = new SqlParameter("@AvailableOnly", SqlDbType.Int);
ParAvailOnlyA.Value = tmpAvailableOnly;
MyDataAdapter2.SelectCommand.Parameters.Add(ParAvailOnlyA);

SqlParameter ParProdFormA = new SqlParameter("@ProdForm", SqlDbType.Int);
ParProdFormA.Value = tmpProdForm;
MyDataAdapter2.SelectCommand.Parameters.Add(ParProdFormA);

MyDataAdapter2.SelectCommand.CommandTimeout = int.MaxValue;
MyDataAdapter2.Fill(DS, "ProdForms");

DS.Relations.Add("MyRelation", DS.Tables["Products"].Columns["StockSiPk"], DS.Tables["ProdForms"].Columns["StockSiPk"]);

Products.DataSource = DS.Tables["Products"].DefaultView;
Products.DataBind();

for (int i = 200; i > 0; i--)
{
//Nothing here just waiting toprevent timeouts -- not sure if this is really working
}
}

Re: Nested Datalist Selection sometimes fails when large data or clicking to fast -- Guessing Timeout ?? Ideas??? Going Crazy!

Harvey Saayman1-Jul-08 22:39

Harvey Saayman

1-Jul-08 22:39

tip:

use PRE tags when posting code blocks, then someone might make an effort to actually read it...

Harvey Saayman - South Africa
Junior Developer
.Net, C#, SQL
you.suck = (you.passion != Programming)

How can we convert string to Brush ?

Mohammad Dayyan1-Jul-08 10:42

Mohammad Dayyan

1-Jul-08 10:42

Hi there.
I want to convert "Black" string to Brush.

For example something like this :

this.comboBoxColor.Background = (Brush)"Black";

How can we do it?
Can you help me ?

Freshman

Re: How can we convert string to Brush ?

User 66581-Jul-08 10:49

User 6658

1-Jul-08 10:49

This may work depending on the input string:

string colorName = "Black";
SolidBrush brush = new SolidBrush(Color.FromName(colorName));

You can find a list of available colors here[^].

regards

modified 12-Sep-18 21:01pm.

Re: How can we convert string to Brush ?

Mohammad Dayyan1-Jul-08 15:11

Mohammad Dayyan

1-Jul-08 15:11

Thanks Greeeg.
This code doesn't work in WPF.
I'm using WPF !

Freshman

Re: How can we convert string to Brush ?

Christian Graus1-Jul-08 15:55

Christian Graus

1-Jul-08 15:55

Well, he's given you the only possible answer. That's how you get a color from a string, you need to build whatever brush type you need from there.

Christian Graus

Please read this if you don't understand the answer I've given you. If you're still stuck, ask me for more information.

Re: How can we convert string to Brush ?

Bert delaVega1-Jul-08 18:23

Bert delaVega

1-Jul-08 18:23

Xaml?

Background="Black"

Re: How can we convert string to Brush ?

Bert delaVega1-Jul-08 18:43

Bert delaVega

1-Jul-08 18:43

I may have misread your question?

In code:

ComboBox comboBox1 = new ComboBox();

Brush backgroundBrush = Brushes.Black;

this.comboBox1.Background = backgroundBrush;

In Xaml:

comboBox1 background="Black"

How to place Assemblies or DLL's in a subfolder

earlgraham1-Jul-08 10:41

earlgraham

1-Jul-08 10:41

I would like our project DLL’s placed into a sub-folder(\plugins). But when I try to run the application, it can’t find them.

In the reference paths, I added a relative search path (.\plugins) and tried a micro path ($(TargetPath\plugins)). Neither seems to work. Unless the dll is in the same directory, I get an exception. The exceptions are the same. Can’t find file.

Thanks Cry | :((

Programmer
Glenn Earl Graham
Austin, TX

Re: How to place Assemblies or DLL's in a subfolder

Pete O'Hanlon1-Jul-08 11:03

Pete O'Hanlon

1-Jul-08 11:03

By default, your application looks for its assemblies in one directory, so the exe and the dlls should be in the same directory. If you want to do something different then you have to take over the whole lifecycle of the assembly. In other words, you need to look at Assembly.Load.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: How to place Assemblies or DLL's in a subfolder

earlgraham8-Jul-08 11:35

earlgraham

8-Jul-08 11:35

After research I also found that you can give the X.exe an X.exe.config file that defines other sub-folders to search.

This works for me.

Thanks
Glenn

Programmer
Glenn Earl Graham
Austin, TX

accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 9:19

Sajjad Izadi

1-Jul-08 9:19

hi friends,
i have 16 images in my form, but what i want is to access them by an index or something that makes it easy to call them. i don't want to call them their name (which is clearly diffrent from an other) each time. i want to make an array of them. how can i do that? Smile | :)

generally, how can i achive the controls (such as buttons, textboxes, etc) in my form?
is there any 'foreach'-like way?

thanks

modified on Tuesday, July 1, 2008 3:45 PM

Re: accessing objects in form by index or somthing like index

Pete O'Hanlon1-Jul-08 9:44

Pete O'Hanlon

1-Jul-08 9:44

Well, you could use one of the many array or list type structures that .NET supports. You could always implement this by creating a generic List of your images, which can be iterated over with a minimum of fuss. For example:

List<Image> images = GetImagesFromDb();
foreach (Image img in images)
{
  // Do something useful...
}

Deja View - the feeling that you've seen this post before.

My blog | My articles

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 9:52

Sajjad Izadi

1-Jul-08 9:52

I have to fill the list each time the programs starts, but for this, i have to get the name of each picture and write a line of code for adding each to list.
Imagine i have dragged some PictureBox from toolbox in design form. now i want them without calling their name. i want them in in an array. how is it? or something like this:

foreach(Object obj in ...)
    if (obj is Image) MessageBox.Show("this is an image");

what should i write in blank?

thanks for your answer

Re: accessing objects in form by index or somthing like index

User 66581-Jul-08 10:31

User 6658

1-Jul-08 10:31

Do you mean something like this?

foreach (Control c in this.Controls)
{
   PictureBox pic = c as PictureBox;
   if (pic != null)
      ...
}

regards

modified 12-Sep-18 21:01pm.

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 10:37

Sajjad Izadi

1-Jul-08 10:37

yes, thank you. that can be what i was looking for Big Grin | :-D

Re: accessing objects in form by index or somthing like index

luisnike191-Jul-08 9:59

luisnike19

1-Jul-08 9:59

use an ImageList, it's better

http://msdn.microsoft.com/en-us/library/fat9bdzd(VS.80).aspx[^][^]

Cool | :cool:

luisnike19

Re: accessing objects in form by index or somthing like index

Sajjad Izadi1-Jul-08 10:41

Sajjad Izadi

1-Jul-08 10:41

thank you but isn't the ImageSize of pictures limited (256 * 256)? what is the solution? how can i have something like ImageList but with much bigger size of image?

thanks again

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