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'Microsoft.Reporting.WinForms.ReportViewer' does not contain a definition for 'ReportSource' and no extension method 'ReportSource' accepting a first argument of type 'Microsoft.Reporting.WinFord (are you missing a using directive or an assembly reference?
Updated 18-May-17 1:58am

1 solution

First check that "WinFord" should not be "WinForm" or "WinForms".
Then if the problem persists, put your cursor in the word ReportSource and hover the mouse over it. A small blue line should appear at the beginning. Use the mouse to open the drop down from this line and it will have options to cure the problem.

If the line does not appear, check that they appropriate assembly (Microsoft.ReportViewer.WinForms in microsoft.reportviewer.winforms.dll) is listed under the Project References - add it if it isn't.
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