fractional value saved as zero

You need to post here the part of the code that do the insert into SQL table.
Can be a format issue like 0,5 instead of 0.5

In VB, you have to be careful if Option Strict is set to Off in the project's properties, which is the default, or at the top of the code window.

In such a case, if you assign a decimal value to any integer type (Integer, Short, Byte, Long), the decimal is automatically removed without any warning or error. It's always better to work with Option Strict On to be advised of such potential problems.

Thank you all for the input.
I am somewhat of a novice but have succeeded in creating an application that is otherwise working well.
Only recently did I first have the occasion to bill for a "half hour", i.e. 0.5 hours and noticed that it displayed on the invoice as "0.0" hours.  Below is the code segment that is involved in assigning the data to the new datarow.  Note that other aspects of my application that are saving decimal numbers to the sql database which are directly bound to fields in the vb application are working fine.  The apparent difference here is that I am saving the datarow to the sql database programmatically.  

Code:

                Dim Ndr As DataRow
                'set it to a new row
                Ndr = ProfProjectDataSet.Invline.NewRow



                Ndr("InvoiceID") = invno
                Ndr("InvBillCatID") = JobCostDataGridView.Rows(i).Cells("JobCostBillCatID").Value.ToString
                Ndr("InvQuan") = JobCostDataGridView.Rows(i).Cells("JobCostQuan").Value
                Ndr("InvUnit") = JobCostDataGridView.Rows(i).Cells("JobCostUnit").Value.ToString
                Ndr("InvPrice") = JobCostDataGridView.Rows(i).Cells("JobCostPr").Value.ToString
                Ndr("InvDesc") = JobCostDataGridView.Rows(i).Cells("JobCostDesc").Value.ToString
                Ndr("InvLogDate") = JobCostDataGridView.Rows(i).Cells("JobCostLogDate").Value.ToString
                Ndr("InvExtended") = JobCostDataGridView.Rows(i).Cells("JobCostExtended").Value.ToString
                Ndr("InvGross") = JobCostDataGridView.Rows(i).Cells("JobCostGross").Value.ToString
                Ndr("JobCostID") = JobCostDataGridView.Rows(i).Cells("JobCostID").Value
                Ndr("InvSource") = JobCostDataGridView.Rows(i).Cells("JobCostSource").Value.ToString
                Ndr("InvPPaySItemID") = JobCostDataGridView.Rows(i).Cells("JobCostPPaySItemID").Value

               

                'add the row to the data table
                ProfProjectDataSet.Invline.Rows.Add(Ndr)

                'save the new Invoice data row
                saveinvlines()

Compare your computer regional settings against the server regional settings, specially for numbers.

Jacques,

Thank you for the detailed explanation.  I actually was very careful and consistent in the assignment of data types both on the sql and vb end.  However I had not been using "option strict" and realize now that letting vb determine the data type where there is an inconsistency could be an issue.
In testing, when I setup a msgbox to read out the value of ndr("invQuan") where the expected value should have been 0.5, that variable does contain 0.5.  Somewhere then its data type must be somehow incorrect and I have to figure out why and how.
Thanks again for the help.

Do not use a MessageBox to interpret what happens in your application when you have problems. Use the debugger.

By settings up breakpoints in strategic locations, you can pause the application and look around for variable values and run the code line by line and see when and how the values are manipulated.

If you are not familiar with the debugging Tools, give a look at http://msdn.microsoft.com/en-us/library/aa290042(v=vs.71).aspx. It will give you a rundown of the most often used Tools available.