How to add two columns in different dataset (SSRS) [closed] - reporting-services

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how to add two columns in table. What's the right expression in this case.
Be informed that I have two dataset (Extra Deduction, Checklist), these two dataset has numeric column value, how to add these two columns with different dataset.
these steps I did (may it help):-
Open Visual Studio - New Project - in Business Intelligence section I chose Reporting Service.
Then right click on Reports folder then I chose "Add new report".
Then in Report Wizard I set Data Source name "DataSource1" and chose "Microsoft Dynamics CRM Fetch" connection type.
In Query Builder I put the XML query to bring the data that I want, it's contains two columns (Reference Number, Deduction value), dataset name is (DedctionDS).
Then I added one more columns in the table to get another value from another dataset.
Then I made the second dataset called (ChkListDS) with XML query to bring two columns (Reference Number, Checklist value).
In the new column in table, I made an expression to bring the value from other dataset, the expression is ( =Lookup(Fields!DedctionRefNo.Value, Fields!ChkListRefNo.Value, Fields!ChecklistValue.Value, "ChkListDS") ).
Until now the data are perfect, but I need now to make Summation between (Deduction value) and (Checklist value), which they're in different dataset .
Please see the below picture to know what i'm trying to do .
I hope I explained it very well .
Any help in this regard will be highly appreciated.
Thanks ..

Answer 1

If it were the same source of data (preferably SQL Server), I would advise you to use SQL join to create one dataset. However, it seems that there is a problem with that, so you have to user another strategy.
What I have seen in another project (not my code) is that you can use one datasource as the main one, and for each row of that datasource look for the matching rows in another one. This requires Lookup() function in SSRS, and you have obviously found that it is the way to correlate two datasets.
Only thing you have to do now is to get the number from the value you have received using the lookup function and add it to the column of your choice.
Your starting expression is:
= Lookup(
Fields!DedctionRefNo.Value,
Fields!ChkListRefNo.Value,
Fields!ChecklistValue.Value,
"ChkListDS")
To convert it to the decimal representation (I hope that is what you have in the database as source), you need CDec() function:
= CDec(Lookup(
Fields!DedctionRefNo.Value,
Fields!ChkListRefNo.Value,
Fields!ChecklistValue.Value,
"ChkListDS"))
And at last, you want to add it with your first value, like:
= CDec(Lookup(
Fields!DedctionRefNo.Value,
Fields!ChkListRefNo.Value,
Fields!ChecklistValue.Value,
"ChkListDS"))
+ Fields!{Your-deduction-value-field-name}
And if your-deduction-value-field in the database is not decimal, you have to cast it to decimal as well, using the same CDec() function.