How to Binding data from WYSIWYG Editor

Get Content

protected void SaveContentButton_Click(object sender, EventArgs e)
{
    // Access the content from the hidden field
    string editorContent = EditorContentHiddenField.Value;

    // Process the editorContent further as needed
    // ...
}

Hi khadar mohammad try the below example:

C#

using System;
using System.Web.UI;

public partial class MyPage : Page
{
    protected void SubmitButton_Click(object sender, EventArgs e)
    {
        // Get the content from the editor
        string content = editorTextBox.Text;

        // Now you can use the 'content' variable as needed.
        // For example, you can store it in a database or process it further.

        // For demonstration purposes, let's show an alert with the content:
        ClientScript.RegisterStartupScript(GetType(), "ShowContent", $"alert('{content}');", true);
    }
}

Refer this:

https://www.c-sharpcorner.com/article/asp-net-mvc5-rich-text-wysiwyg-editor/