Call javascript function from webpart

May be duplicate but how can I do this in a webpart?

ClientScript.RegisterStartupScript(this.GetType(), "alert", "HideLabel();", true);

What should I import for this? Importing from Page is not working

javascript

This article is a great reference for this exact question.

Although I'm not sure what version you're on, it looks like your syntax is incorrect.

ScriptHelper.RegisterStartupScript(this, typeof(string), "alert", "HideLabel();", true);

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Thanks a lot Brenden, works perfect.

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