[Solved] DropdownList value is getting null in ASP.NET MVC

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As you said in the comment that:

after submitting the form companyId = null

This is actually becuase your drop down select input field name is CompanyName instead of CompanyId

So name it CompanyId as follows:

<div class="form-group">
    <strong class="strong">Company Name</strong>
    <div class="col-md-10">
        @Html.DropDownList("CompanyId", (IEnumerable<SelectListItem>)ViewBag.CompanyName, "Select Company", new { @class = "form-control" })

        @Html.ValidationMessageFor(model => model.CompanyId, "", new { @class = "text-danger" })
    </div>
</div>

Now CompanyId will have a value on post.

solved DropdownList value is getting null in ASP.NET MVC