Hi smile,

Share the code and complete error details.

Else refer below article to implement Crystal Report in Windows Form.

Basic Crystal Report Tutorial with example in Windows Forms (WinForms) Application using C# and VB.Net

When there is a little data then it is working fine. when there is a huge data in the database then it is taking too much time and after that showing an error and unable to load data

Please share the code.

Or set SqlCommand CommandTimeout to 0 and check.

SqlCommand cmd= new SqlCommand();
cmd.CommandTimeout = 0;