how to call child component method from parent component in blazor?

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First you need to capture a reference of your child component:

<ChildComponent @ref="child" />

Then you can use this reference to call the child’s component methods as you do in your code.

<button onClick="@ShowModal">show modal</button>

@code{
    ChildComponent child; 

    void ShowModal(){
        child.Show();
    }
}

The namespace of your component need to be added by a using either in the page or in _Imports.razor. If your component is in the sub folder Components/ChildComponent.razor then its namespace is {YourAppNameSpace}.Components

@using MyBlazorApp.Components

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