Multiple checkboxes in razor (using foreach)

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You cannot use a foreach loop to generate controls for a collection. The html you’re generating for each checkbox (and for the associated hidden input) is <input type="checkbox" name="item.ToExport" .../>. Your model does not contain a property which is named item.

Use a for loop

@for(int i = 0; i < Model.ExportingGroups.Count; i++)
{
  <tr>
    <td class="js-export-checkbox">
      @Html.CheckBoxFor(m => m.ExportingGroups[i].ToExport)
    </td>
  </tr>
}

Now your HTML will be

<input name="ExportingGroups[0].ToExport" .../>
<input name="ExportingGroups[1].ToExport" .../>

etc. which will correctly bind to your model

Edit

Alternatively you can use a custom EditorTemplate for typeof GroupToExport. Create a partial view /Views/Shared/EditorTemplates/GroupToExport.cshtml

@model yourAssembly.GroupToExport
<tr>
  <td class="js-export-checkbox">
    @Html.CheckBoxFor(m => m.ToExport)
  </td>
</tr>

And then in the main view

@Html.EditorFor(m => m.ExportingGroups)

The EditorFor() method will generate the correct html for each item in your collection based on the template.

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