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· RDL files are created by Report Builder and published to SQL Server for server based report rendering and RDLC files are created by Visual Studio and used for localised report rendering.
· You cannot (easily) adjust the server based RDL file from code without a full deployment and even if you do this then you end up adjusting the same report for all users.
1.) The Dataset section, which details the report fields and their expected data types.
2.) The Tablix header section, which details the column widths.
3.) The Individual columns, which detail the binding information and cosmetics for each cell.
· There are other useful sections (like the headers and report summary) that I have modified but concentrating on these primary sections will giveyou a flavour of whats posisble.