Retrieve the session value of the last debug

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<table cellspacing="5">
    <tr>
        <td>
            <mark>Selectionner Country :</mark>
            @Html.DropDownList("Country",
                        new SelectList(Model, "Code", "Name"),
                        "Select Country 
           new { @class = "form-control", id = "Country" })

        </td>
        <td>...............</td>
        <td>


            <mark>Selectionner le Code Secteur :</mark>
            @Html.DropDownList("Region",
                        new SelectList(Enumerable.Empty<WebApplication_SRP.Controllers.Region>(), "CountryCode", "Name"),
                        "Select Secteur",
                        new { @class = "form-control", id = "Region" })

        </td>
        <td>................</td>
        <td>
            @using (Html.BeginForm("CommDNP3Form", "CommDNP3", FormMethod.Post))
            {
                <mark> Selectionner le Site :</mark>
                @Html.DropDownList("Lsite",
                            new SelectList(Enumerable.Empty<WebApplication_SRP.Controllers.Lsite>(), "CountryCode1", "Name"),
                            "Select Site",
                            new { @class = "form-control", id = "Lsite" })
                @Html.Hidden("hfNom")

            }
        </td>

    </tr>

</table>

What I have tried:

I wanted to recover and keep the value of the third combo. But she is still null:

System.NullReferenceException : 'La référence d'objet n'est pas définie à une instance d'un objet.'

System.Collections.Specialized.NameValueCollection.this[string].get retournée null.

Posted 11-Dec-19 3:39am

Member 14663996

Updated 13-Dec-19 4:50am

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ZurdoDev 11-Dec-19 15:17pm

The problem is likely in your controller not filling in a value. From what you have posted, I'm not sure what else we can do to help.

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Richard Deeming · Answer 1 · 2019-12-13T04:50:00

Quote:

C#

string nom = formCollection["hfNom"].ToString();

That's the line that's causing the exception, because formCollection["hfNom"] is returning null, and you then try to call .ToString() on it.

But the indexer already returns a string, so you don't need that .ToString() call at all:

C#

string nom = formCollection["hfNom"];

Now you just need to work out why you're not passing a value in that field.