I want to declare global DataSet and SqlDataAdapter in module to construct on form or report. Can I do?

There is nothing like global in C#. You need to put these as member of a class and then create a object of this class in your main form and then pass the reference of the class object different forms.

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There is nothing like global in C#. You need to put these as member of a class and then create a object of this class in your main form and then pass the reference of the class object different forms.

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Please mark the post as answer if it is helpfull to you because it boosts the members to answer more and more.