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Custom Cell Format

The RadSpreadsheet's cell-formatting options dialog can be customized. The existing options divided into three categories Number, Currency and Date and Time can be replaced by or complemented with additional formatting options. This can be achieved by adding a user control to the RadSpreadsheet's CustomFormatTemplate:

<telerik:RadSpreadsheet runat="server" ID="RadSpreadsheet1">
        <uc1:SpreadsheetCustomFormat runat="server" ID="SpreadsheetCustomFormat" />

A sample code library project demostrating this approach can be downloaded here.

The following screenshot shows the result of modifying the user control and including two additional formatting options ("100.00 euro" and "€100") in the Currency tab.

Custom Format

Formatting options


The format strings are compatible with the Excel number formats, with some exceptions:

  • Exponent (scientific) notation (E+, E- Excel formats)

  • Filling cell width (* Excel format)

A format string consists of one or more sections, separated by semicolons. A section optionally specifies a color and a condition.

The following example demonstrates how to display a number with up to three decimals.


The following example demonstrates how to display positive numbers, or zero, in green, and negative numbers in red.


The following example demonstrates how to display positive numbers in green, negative numbers in red, and the the "Zero" text in blue if the number is zero.


This example is the same as the previous one, with the difference to display any possible text in the cell in magenta.


Excel documentation mentions that a maximum of four sections are supported, and if all are present, they are interpreted in the following order:

  • Positive numbers format

  • Negative numbers format

  • Format for zero

  • Format for text

Excel also supports a more flexible conditional formatting.

The following example demonstrates how to display numbers greater than 100 in green, numbers less than minus 100 in yellow, and other numbers in cyan.


In this case it is not clear whether only up to four sections are allowed, of which the last one must be text, while the Spreadsheet formatter allows for any number of conditional sections.

Text and Numbers

Character Meaning
0 Digit placeholder. Use this to display insignificant zeroes. For example, 8.9 with the format 00.000 displays as 08.900.
# Digit placeholder. This does not display insignificant zeroes. For example, 12.34 in the ###.### format displays as 12.34.
? Digit placeholder. It is similar to 0, but displays a space character instead of a zero. You can use this to align numbers by decimal point, but you should use a fixed-width font for this to be effective.
. Decimal point.
, Thousands separator, or scale (see below).
\ Escape the next character (display literally).
_ Skip the width of the next character.
"text" Includes a piece of text in the format. Characters inside will not be interpreted in any way, they will just output literally.
@ Text placeholder. Will be replaced with the text in the cell.

Dates and Time

Format String Meaning
m Display month number without leading zero
mm Display month number with leading zero
mmm Display short month name in current culture
mmmm Display full month name in current culture
d Display date number without leading zero
dd Display date number with leading zero
ddd Display the abbreviated week day name
dddd Display the full week day name
yy Display the year as two digit number
YYYY Display the full year number
h Display hour without leading zero
hh Display hour including leading zero
m Display minute without leading zero
mm Display minute including leading zero
s Display second without leading zero
ss Display second including leading zero
[h] Elapsed time in hours
[m] Elapsed time in minutes
[s] Elapsed time in seconds
AM/PM Forces hours to display in 12-hours clock, and displays AM or PM as necessary
am/pm Same as above, but displays lower-case am or pm
A/P Same as above, but displays A or P
a/p Same, but displays a or p

Note that the month and minute specifiers are ambiguous (m or mm). These strings are interpreted as a month number, unless preceded by an hour part (h or hh) in which case it displays minutes.

See Also