I have create webpart in same id and it error "Message: Multiple controls with the same ID 'CampaignSurvey' were found. FindControl requires that controls have unique IDs.".
How can I fix it
In the web part when you assign it to the page at the top of its properties is the ID. If you are hard coding in a custom web part, don't do that. Use dynamic properties in the code behind and pull them from the web part properties/fields.
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