Product Enquiry form using WooCommerce and Contact Form 7: https://www.damiencarbery.com/2017/02/product-enquiry-form-using-woocommerce-and-contact-form-7/

add-cf7-after-short-description-by-action.php

<?php
/*
Plugin Name: CF7 form to all products (after short description, with add_action)
Plugin URI: http://www.damiencarbery.com
Description: Append a Contact Form 7 form to the Short Description section of all Woocommerce products.
Author: Damien Carbery
Version: 0.1
WC tested up to: 8.0.2
*/


// Add the CF7 form between the short description and the 'Add to cart' button.
add_action( 'woocommerce_single_product_summary', 'dcwd_add_cf7_form_after_single_excerpt', 25 );
function  dcwd_add_cf7_form_after_single_excerpt() {
  echo do_shortcode('[contact-form-7 id="73" title="Contact form 1"]'); ;
}

add-cf7-after-short-description-by-filter.php

<?php
/*
Plugin Name: CF7 form to all products (after short description, with add_filter)
Plugin URI: http://www.damiencarbery.com
Description: Append a Contact Form 7 form to the Short Description section of all Woocommerce products.
Author: Damien Carbery
Version: 0.1
WC tested up to: 8.0.2
*/


// Add the CF7 form between the short description and the 'Add to cart' button.
add_filter('woocommerce_short_description', 'dcwd_append_cf7_form_to_short_description');
function  dcwd_append_cf7_form_to_short_description( $short_description ) {
  return $short_description . do_shortcode('[contact-form-7 id="73" title="Contact form 1"]');
}

add-cf7-popup-to-product-page.php

<?php
/*
Plugin Name: CF7 to product page
Plugin URI:  https://www.damiencarbery.com/2018/06/customise-choose-an-option-dropdown-item/
Description: Add a Contact Form 7 form to the product page.
Author: Damien Carbery
Version: 0.1
WC tested up to: 8.0.2
*/

add_action( 'woocommerce_after_add_to_cart_button', 'dcwd_add_cf7_form_under_add_to_cart' );
function dcwd_add_cf7_form_under_add_to_cart() {
	// Add the hidden contact form. It will be displayed when the button is clicked.
	echo '<div id="askinfo" style="display:none">' . do_shortcode( '[contact-form-7 id="73" title="Contact form 1"]' ) . '</div>';
	// Button to open the popup.
	echo '<button><a href="#TB_inline?height=600&width=400&inlineId=askinfo" class="thickbox">Ask for Info</a></button>';
	// Add the thickbox JS and CSS for the popup.
	add_thickbox();
}

cf7-get-post-info-for-report.html

[dynamic_hidden page-url "CF7_URL"]
[dynamic_hidden site-url "CF7_bloginfo show='url'"]
[dynamic_hidden post-id "CF7_get_post_var key='ID'"]

cf7-retrieve-product-sku.txt

<p>SKU<br />
[dynamic_text product-sku "CF7_get_custom_field key='_sku'"]</p>

In the email:
SKU: [product-sku]

cf7-to-product-page-specified-categories.php

<?php
/*
Plugin Name: CF7 to product page (specified categories)
Plugin URI:  https://www.damiencarbery.com/2018/06/customise-choose-an-option-dropdown-item/
Description: Add a Contact Form 7 form to the product page of products in specified categories only.
Author: Damien Carbery
Version: 0.1
WC tested up to: 8.0.2
*/

add_action( 'woocommerce_after_add_to_cart_button', 'dcwd_add_cf7_form_under_add_to_cart' );
function dcwd_add_cf7_form_under_add_to_cart() {
	// Add the contact form for products in the tshirts category.
	if ( has_term( array('tshirts', 'accessories' ), 'product_cat' ) ) {
		echo do_shortcode( '[contact-form-7 id="73" title="Contact form 1"]' );
	}
	
}

cf7-use-post-info-for-report.txt

Page URL: [page-url]
Edit URL: [site-url]/wp-admin/post.php?post=[post-id]&action=edit

cf7_form_shortcode.html

[contact-form-7 id="27" title="Product Enquiry"]

cf7_hidden_field.html

[dynamic_hidden product-name "CF7_get_post_var key='title'"]

cf7_visible_field.html

<label>Product Name
[dynamic_text product-name "CF7_get_post_var key='title'"]</label>

wc-cf7-form-to-all-products.php

<?php
/*
Plugin Name: CF7 form to All Products
Plugin URI: http://www.damiencarbery.com
Description: Append a Contact Form 7 form to the Product Description section of all Woocommerce products.
Author: Damien Carbery
Version: 0.2
WC tested up to: 8.0.2
*/

add_filter('the_content', 'dc_cf7_form_to_all_products');
function dc_cf7_form_to_all_products($content) {
    if ( class_exists( 'woocommerce' ) && is_product() && is_main_query() ) {  // Check suggested by: https://pippinsplugins.com/playing-nice-with-the-content-filter/
        return $content . '[contact-form-7 id="8018" title="Product Enquiry"]';
    }
    
    return $content;
}


// Ensure the Description tab is present as it is needed by the_content filter.
add_filter( 'woocommerce_product_tabs', 'dc_cf7_add_description_tab', 20 );
function dc_cf7_add_description_tab( $tabs ) {
    global $product, $post;

    // Description tab - add if there is no post content (i.e. if the Description is empty)
    // because woocommerce_default_product_tabs() in woocommerce/includes/wc-template-functions.php
    // excludes it if the post content is empty.
    if ( ! $post->post_content ) {
        $tabs['description'] = array(
            'title'    => __( 'Description', 'woocommerce' ),
            'priority' => 10,
            'callback' => 'woocommerce_product_description_tab',
		);
	}
    
    return $tabs;
 }

wc-cf7-form-to-in-stock-products.php

<?php
add_filter('the_content', 'dc_cf7_form_to_all_products');
function dc_cf7_form_to_all_products($content) {
    if ( class_exists( 'woocommerce' ) && is_product() && is_main_query() ) {  // Check suggested by: https://pippinsplugins.com/playing-nice-with-the-content-filter/
        global $post;
        $product = wc_get_product($post);
        // Only display the form when the product is in stock.
        if ( $product->is_in_stock() ) {
            return $content . '[contact-form-7 id="27" title="Product Enquiry"]';
        }
    }
    
    return $content;
}

wc-cf7-form-to-short-description.php

<?php
/*
Plugin Name: CF7 form to All Products
Plugin URI: http://www.damiencarbery.com
Description: Append a Contact Form 7 form to the Short Description section of all Woocommerce products.
Author: Damien Carbery
Version: 0.1
WC tested up to: 8.0.2
*/

add_filter('woocommerce_short_description', 'dc_cf7_form_to_all_products');
function dc_cf7_form_to_all_products($content) {
    if ( class_exists( 'woocommerce' ) && is_product() && is_main_query() ) {  // Check suggested by: https://pippinsplugins.com/playing-nice-with-the-content-filter/
        return $content . '[contact-form-7 id="27" title="Product Enquiry"]';
    }
    
    return $content;
}

woocommerce_check_fatal_error.txt

[03-Feb-2017 20:53:18 UTC] PHP Fatal error:  Call to undefined function is_product() in /wp-content/plugins/wc-cf7-form-to-all-products.php on line 14

Thank you so much to answer me. Yes, I use Woo-Commerce on my site, I have been made form in contact form 7 below:

I want to redirect the form to the cart page with a price which shows in the total field. You can see my form, I've attached it.

Can You tell me the way to redirect to the cart page through the button which I changed submit to Add to cart.

Can You tell me the way to redirect to the cart page through the button which I changed submit to Add to cart.

Redirect to cart is not hard - the CF7 docs show how to do it: https://contactform7.com/redirecting-to-another-url-after-submissions/

This redirect will not show the price. I think that you should use a variable product. CF7 is not a good solution for this.
Why do you not use a variable product?

OK, Thanks Now I will use variable product:)