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String.Format an integer to use a thousands separator with decimal value in danish culture

I have a string totalPRice which holds a value like this 1147,5
I want two things.
1)round the value so that there is always two digits after ,
2)Implement thousands separator in this string, So that final out put will be some thing like this 1.147,50
I have tried some thing like this
String.Format("{0:0.00}", totalPRice)
It does my first requirement correctly by producing an output 1147,50.
But I am way behind in my second requirement. Can any one tell me how I can achieve this?
Note: In danish culture . stands for , and , stands for .

You can refer to Standard Numeric Format Strings and use
string.Format("{0:N2}", 1234.56)
You may also specify the culture manually, if danish is not your default culture:
var danishCulture = CultureInfo.CreateSpecificCulture("da-DK");
string.Format(danishCulture, "{0:N2}", 1234.56);
see MSDN Reference for CultureInfo

You should create a culture-specific CultureInfo object and use it when converting the number into a string. Also, you can set the default culture for your whole program.
Then, your code will look like this:
// create Dennmark-specific culture settings
CultureInfo danishCulture = new CultureInfo("da");
// format the number so that correct Danish decimal and group separators are used
decimal totalPrice = 1234.5m;
Console.WriteLine(totalPrice.ToString("#,###.##", danishCulture));
Note that . and , in the formatting string are specified opposit as you want. This is because they identify decimal and group separators, and are replaced with the correct culture specific-ones.

Try this:
String.Format("{0:N2}", totalPRice)
Another possibility is to use the ToString(string format) overload.
totalPRice.ToString("N2");

If this is a currency value (money!), then it's better to use the current format specifier 'C' or 'c':
string.Format("{0:C}", 1234.56)
Normally I don't write the number of decimal digits since it comes from the international configuration.
You may way to use a different colture specifier if you don't want to use the default one.
var colture = CultureInfo.CreateSpecificCulture("§§§§§");
string.Format(culture, "{0:C}", 1234.56);
where §§§§§ is the string that identifies the desired colture.

Try this for Price format. Put it under template field instead of BoundField.
<%#(decimal.Parse(Eval("YourDataField").ToString())).ToString("N2")%>

Convert number in textbox to float C#

I have textbox that accept numbers. Those numbers will be saved in database.
When I enter number like 2,35 and convert to float and send to database I get error because database accept only number with dot, e.g. 2.35
float num = float.Parse(textBox1.Text);
num is still 2,25
How to manage that? I've tried with CultureInfo.InvariantCulture but I never get what I want

You can try the following:
float.Parse(textBox1.Text.Trim(), CultureInfo.InvariantCulture.NumberFormat);
I hope this would've solved the issue.

The easiest way is to replace ',' with '.' in like:
float num = float.Parse(textBox1.Text);
string stringValue = num.ToString().Replace(',', '.');
Then send "stringValue" to database.
I hope that helps you.

use this:
CultureInfo.CreateSpecificCulture("en-US");
I have same problem back then and it solved by code above

num is 2,25 because it's shown to you in your culture. It will be passed correctly to the database, provided you use the usual mechanisms (i.e. prepared statements with parameters). If you insist on manually gluing together SQL, then by all means use InvariantCulture to format the number, but generally, please don't.

This is a common globalization issue. What you have to define is a single culture in which to store the data itself, since you are storing it as a string value. Then, do ALL your data input and handling using that culture. In our code, we have several blocks that look similar to this in order to handle multi-cultural math and data display:
//save current culture and set to english
CultureInfo current = System.Threading.Thread.CurrentThread.CurrentCulture;
System.Threading.Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
//Do Math and Data things
//restore original culture
System.Threading.Thread.CurrentThread.CurrentCulture = current;
This way you can make sure that all the data is handled and stored the same way, regardless of the culture being use to generate or display the data.
Edit
To do the data save, and converting the number to a string, you would do things exactly the same way. While you have the current threads CultureInfo setting as "en-US", the .ToString() methods from all the numbers will use "." instead of "," for the decimal point. The other way to do it is specify a format provider when calling .ToString().
decimalNumber.ToString(new CultureInfo("en-US"));
This specifies that when you convert the number to a string, use the NumberFormat from the provided culture.

How to format string with floating point?

In database I have a PRICE field type of float with value 54342.76 and I want to display it on gridview as 54,342.76. How can format this values?

Try
float f = 54342.76F;
string s = f.ToString("0,0.000", CultureInfo.InvariantCulture);
Console.WriteLine(s);
You could use c specifier instead, however it prints currency sign also.
Use CultureInfo.InvariantCulture as in some localizations , thousands separator may be missing.
Also read Decimal.ToString Method, Standard Numeric Format Strings, Custom Numeric Format Strings

this is what I use:
x.ToString("c")

String.Format("{0:n}", 54342.76F)
The N method is a good solution since it should respect the user's locale while others like:
String.Format("{0:#,###,###.##}", 54342.76F)
Could bypass current culture in some situations. Use {0:n0} instead of {0:n} if you want to display the number without decimals.

In the past I have used this: http://www.codeproject.com/Articles/11531/Money-DataType
It formats money perfectly when used in a DataGridView column.

Can't parse text to Decimal

In Form_load I have
txtAlteFonduri.Text = "5,00";
txtFReparatii.Text = "15,00";
txtFRulment.Text = "20,00";
and in another function I want to parse text as decimal
decimal alteFonduri = Decimal.Parse(txtAlteFonduri.Text);
decimal fondRulment = Decimal.Parse(txtFRulment.Text);
decimal fondRepar = Decimal.Parse(txtFReparatii.Text);
but I have an error in the second line
Input string was not in a correct format.

You need to specifically add the number format. For your examples above, the following should work:
decimal alteFonduri = Decimal.Parse(txtAlteFonduri.Text, CultureInfo.GetCulture("de-DE"));
Otherwise, the system's culture information is used.

You are using a different culture to what decimal.Parse() is expecting (it expects the decimal point '.' but you provide a comma. Using the correct culture should correctly parse the strings, although I can run your code without having any errors...
You can use Decimal.Parse(variable, CultureInfo.GetCultureInfo("Culture-Name"));

You have to use this overload of Decimal.Parse and supply a IFormatProvider matching the culture of your input. You should also consider using one of the Decimal.TryParse methods for better error handling.

comma separated double

Where can I set style in which double is writte by ToString() method ?
I am getting for example 2,2345 while I want to have 2.2345
thanks for ay hints,
bye

double a = 2.2345;
string b = a.ToString(CultureInfo.InvariantCulture);

You need to specify a FormatProvider, ususally as a CultureInfo.
For example:
string s = d1.ToString(System.Globalization.CultureInfo.InvariantCulture);

The Double.ToString() method is overloaded, so you can call it with a couple of different signatures to get the output you want.
In this case, your culture settings are affecting the output of the ToString() function. To get the result that you want, you should call Double.ToString(IFormatProvider), passing in CultureInfo.InvariantCulture:
myDouble.ToString(CultureInfo.InvariantCulture);
This should solve your issue.
For future reference, note that another common version of Double.ToString() is the Double.ToString(String) overload. The String parameter is a numeric format string, either one that is predefined or one that you specify. For example:
myDouble.ToString("format string here");
MSDN has a couple of articles on format strings: Standard Numeric Format Strings and Custom Numeric Format Strings.

If you would want the affect to be on your whole application. This could be set on initialization. Thus, note that this would mean an effective change on ALL cultures.
var culture = new CultureInfo(Thread.CurrentThread.CurrentCulture.Name);
culture.NumberFormat.NumberDecimalSeparator = ".";
Thread.CurrentThread.CurrentCulture = culture;
Then just:
string value = (1002.300).ToString();