In beginning 'reportviewer' was not showing in toolbox than i installed "Microsoft RDLC Report Designer" from this link "https://marketplace.visualstudio.com/items?itemName=ProBITools.MicrosoftRdlcReportDesignerforVisualStudio-18001" then I got reportviewer in toolbox but now when I want to add reportviewer to the form but it shows this error the moment I drag and drop the report viewer from toolbox to form.
The report viewer does not come with the designer but is a NuGet package you can add on.
Right click on you project (or solution) and select Manage NuGet Packages.
Install the package for the type of project you creating, for example:
Microsoft.ReportingServices.ReportViewerControl.WebForms Microsoft.ReportingServices.ReportViewerControl.WinForms
etc...
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