Displaying Dynamic Columns in SSRS Report

Problem: How to display selected columns dynamically in SSRS reports.
Example: A report contains more than 30 fields. Some users want to see only 5 fields, some users 10 fields, and other may want to see 20 fields.
Solution: Add a Report Parameter having the values as the name of all the fields of dataset. Now set hidden expression for each column of the tabular report.

Here is the solution with an example:

STEP1:
Create a report with required dataset. Drag and drop table control and select dataset fields.
In my example, I have following fields in the dataset: Year, Quarter, Month, Date, Product Name, Customer Name, Sales Region, Sales Country, Order Number, Sales Amount.

STEP2:
Create a dataset dsColumns using below query:
SELECT 1 ID, 'Year' AS ColumnName UNION
SELECT 2 ID, 'Quarter' AS ColumnName UNION
SELECT 3 ID, 'Month' AS ColumnName UNION
SELECT 4 ID, 'Date' AS ColumnName UNION
SELECT 5 ID, 'Product Name' AS ColumnName UNION
SELECT 6 ID, 'Customer Name' AS ColumnName UNION
SELECT 7 ID, 'Sales Region' AS ColumnName UNION
SELECT 8 ID, 'Sales Country' AS ColumnName UNION
SELECT 9 ID, 'Order Number' AS ColumnName UNION
SELECT 10 ID,'Sales Amount' AS ColumnName


STEP3:
Create a new parameter with name pDisplayFields and Promt Display Columns as shown below:

In Available Values of Report Parameter Properties wizard, select Get values from a query, select dsColumns in Dataset, ColumName in value field and label field.

In Default Values of Report Parameter Properties wizard, select Get values from a query, select dsColumns in Dataset, ColumName in value field.

STEP4:
Now you have to set the expression to display the colummns which are selected in the pDisplayColumn parameter. Right click on First Column (Year in my example) and click Column Visibility...

Write following expression in Show or hide based on an expression of Column Visibility wizard:
=IIF(InStr(JOIN(Parameters!pDisplayFields.Value,","),"Year")>0,False,True)

Now repeat this expression for all the columns by modify the expression for the respective column name accordingly.

Thats all. Now preview the report. You will see all the columns by default.

Now select required columns in Display Column parameter to modify the report layout at run time.