I have a wpf project, with a telerik reports Report Library project, a lot of time ago I don't make a reports here, I need to make a new report, and I do it, and I add a SQL data source, with a sql query and I run it and response me with the data ok, but in design mode, when I try to add a textbox, the reporter don't show me any info in "fields", I review all and I don't find what is wrong, what's going on??
Telerik Reporting to WPF
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The first thing I recommend checking is whether the data scope of the item has those fields. For example, if the textBox is added directly to the report, in a report section, the data object that this textBox has access to would be the data scope of the Report.DataSource.
The SqlDataSource that you have created must be set as the Report.DataSource, and if it can retrieve the data schema successfully, you should start seeing the fields in the Data Explorer and in the Fields section of the expression dialog.
If you keep experiencing this issue, please have a look at the Data Explorer does not show all or any data fields KB article.