Question

In this table I want to insert values in the weight column that is of float type with decimal
values 00 like 100.00, 150.00, 25.00 .

In this table if I am going to insert 25.5 then it will show decimal value bit if I am storing 135.00 it will store 135 only not showing decimal if 00.

Answer 1

I’m not sure from your question what you are actually looking for. Storage and Display are two separate things.

STORAGE

If you want to store a number with a fixed precision in SQL SERVER use DECIMAL

CREATE TABLE MyTable
(
    MyNumber DECIMAL(5,2)
)

The above will store 5 digits, 3 before the decimal point, and two after.

Here’s the documentation: http://msdn.microsoft.com/en-gb/library/ms187746.aspx

If you are storing currency values, then there is the MONEY datatype too: http://msdn.microsoft.com/en-us/library/ms179882.aspx

DISPLAY

If you are more interested in the display of values rather than the storage (You’ve already mentioned they are floats in the database) then in your C# application you can use something like this:

 string display = string.Format("{0:0.00}", myNumber);

Here’s the documentation for custom formatting of numbers into strings: http://msdn.microsoft.com/en-gb/library/0c899ak8.aspx