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# How do I round numbers in C# in a text box?

Posted on 2004-10-18
2,348 Views
I am currently building a Web Page in Visual Studio.NET.... (C#).  I am trying to figure out how to 'round numbers" that I am pulling into text boxes in my Web Form from a DB.  Currently, When I view the page the numbers are coming up as "0.96544456754363."  I want to round them to  "0.97". How would I do this in C#?
Thanks
0
Question by:bripena
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LVL 9

Accepted Solution

msdixon earned 250 total points
ID: 12340317
assuming it's a decimal object...

decimal val = 0.96544456754363;

val.ToString("n2"); // this tells it to display a number with two trailing decimal points. i.e. 28.1038 will display as 28.10
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Author Comment

ID: 12340358
now- being I am pulling from a DB and these numbers are displayed in text boxes- can I use the decimal val to account for any value that would appear there- in other words- I don't want to key in every value- so what can I use to account for all vlaues that would be pulled into that text box???
0

LVL 3

Expert Comment

ID: 12340515
You would need to check the text and validate whether it is a number(float) or whether it is text. IF you got text from the db, perhaps you could put NaN (Not a number) as text.

So you could validate the text using a parser to check for only numbers(float) and then round those off to 2 digits as shown.
0

Author Comment

ID: 12341231
the number os a float.....
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Author Comment

ID: 12341247
if I integrate the following....
double x;

x = textBoxValue;

double roundX = System.Math.Round(x,2);

The problem is - it is not recognizing 'textboxvalue' and I have multiple text boxes in which this needs to apply to.....
any thoughts???
0

LVL 9

Expert Comment

ID: 12343107
what is textBoxValue?

Have you declared it anywhere?

Cheers,
S Sansanwal
www.sansanwal.com
0

LVL 3

Expert Comment

ID: 12343720
this is cryptic code.

Taking a shot,

assume
string textboxvalue = Textbox1.Text

if(isString(textboxvalue)==false) // check if string
{
double x = double.Parse(textboxvalue);
double roundX = System.Math.Round(x,2);
// do something
}

What exactly is the code and what is the error?
0

LVL 18

Expert Comment

ID: 12344554
Make a custom textbox component by extending from textbox named numerictextbox and override the Text property. use the above methods to set and get as rounded number
0

LVL 3

Expert Comment

ID: 12345126
String.Format("{0:F2}", 0.96544456754363);          =  .97

double varName = 0.96544456754363D;

String.Format("{0:F2}", varName);                         =  .97

This will round to the nearest fixed(F) decimal point (2).

String.Format("{0:c}", varName);                           =  \$0.97

Displays the number in currency.

Check out this link for a list of all the formating options.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconstandardnumericformatstrings.asp

- Joe
0

LVL 3

Expert Comment

ID: 12345148
Here's an ASP.NET Implimentaion that I've used:

Page.aspx
--------------------------------------------------------------------------------------------------------------------------------------

<asp:DataList id="DataList1" runat="server" Width="100%">
<ItemTemplate>
<asp:Label id=ItemPriceDataListLabel Text="<%# DataItemPrice(Container.DataItem) %>" Runat="server">
</asp:Label>
</ItemTemplate>
</asp:DataList>

Code Behind
--------------------------------------------------------------------------------------------------------------------------------------

protected string DataItemPrice(object DataItem)
{
DataRowView row = (DataRowView) DataItem;
return String.Format( "{0:c}", row["UnitCost"]);
}

This is using Databinding on the DataList.

- Joe
0

Author Comment

ID: 12347169
I tried aacool's method but received the below error- any one know what is wrong????

string textboxvalue=txtclinicaltotal.Text;
if(IsString(textboxvalue)==false)
{
double x = double.Parse(textboxvalue);
double roundX = System.Math.Round(x,2);
// do something
}

c:\inetpub\wwwroot\CREAMPROFILE1\CREAMFORM.aspx.cs(108): The name 'IsString' does not exist in the class or namespace 'CREAM1.WebForm1'
0

LVL 3

Expert Comment

ID: 12352188
isString is a helper function - you need to implement it to check whether the value is a string. One impl is:

public static bool isString(string txt)
{
bool isStr = false;
char[] chr = txt.ToCharArray();
foreach(char ch in chr)
{
if(Char.IsLetter(ch)==true)
isStr = true;
}
return isStr;
}
0

LVL 3

Expert Comment

ID: 12377107
Did you get what you wanted working?
0

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