The configuration element is not declared

Question

I\'m doing some work in Visual Studio 2012 Express Edition. I have added an App.config XML file as follows:

Answer 1

I had the same issue. It is not an error, it is simply a warning; so your application should still compile. I used the following simple config file and the warning is still produced.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime 
             version="v4.0"sku=".NETFramework,
             Version=v4.5"/>
    </startup>
</configuration>

It is an issue that has been raised on the MSDN website, but it does not seem to have been satisfactorily resolved. See link below:

http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/18a1074f-668f-4fe3-a8d9-4440db797439

Answer 2

I was having less space on my drive which might have resulted in incomplete loading of my application solution. This "the-configuration-element-is-not-declared" problem got solved after i created some space on my drive.

Answer 3

Go to XML menu (visual studio top menu item) choose schemas and find for DotNetConfig.xsd and choose Use this schema.

Your problem will resolve for sure

Answer 4

<configuration xmlns="schema URL">
   <!-- configuration settings -->
</configuration>

do changes,like above & try

Answer 5

Choose use this schema. DotNetConfig.xsd

XLM Menu..... Visual Studio

Works perfectly.

Answer 6

I also got the same warning. After thinking about for some time I realized my error working with SQL (MS SQL).

Warning: the 'configuration' element is not declared

Using C#

App.Config code:

<connectionStrings>
    <add name="dbx" connectionString="Data Source=ServerNameHere;Initial Catalog=DatabaseNameHere;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>

*this calls out the database name in the connectionStrings, when I plugged in my SQL code as a practice I always use the database name, schema, then table. This practice didn't carry over well in Visual Studio as I am a beginner. I removed the db name from my SQL syntax and only called from the schema, data table. This resolved the issue for me.

Form.CS:

 using (SqlCommand cmd = new SqlCommand("SELECT * FROM [DatabaseName].[Schema].[TableName] WHERE [MEPeriod] = '2020-06-01'", con))

Updated to:

using (SqlCommand cmd = new SqlCommand("SELECT * FROM [Schema].[TableName] WHERE [MEPeriod] = '2020-06-01'", con))

This worked for me, I hope this is found as useful.