Select Filters on the Dataset Properties dialog box to create filters for the dataset.
Filters that are part of a shared dataset definition on the report server affect all reports that use the shared dataset. Additional filters for the shared dataset can be specified after it is added to a report. These filters affect only the report in which they are defined.
Filters for an embedded dataset affect only the report in which they are defined.
Type or choose the expression to which you want to apply a filter. Click the Expression (fx) button to edit the expression.
Choose the data type for Value. When possible, choose a data type that matches the data type for Expression.
The values in Expression and Value must evaluate to the same data type. For example, if Expression is set to a field that has the data type System.Int32 and Value is set to 7, from the drop-down list, choose Integer.