Sql connection string error - "Error occurred, please contact the system administrator, keyword not supported - metadata"

Dear All,

1. I have added an entry in web.config for sql connection string as below

<add key="KPISqlCS" value="XXXXXXXXXXXXXXXXXXXXXXXXXX++E4IO+Fc9m4E7UUrNFxwQ6EOmbrf6AHuUjM6CIVqMnJH/NiiGlgYuyyIj03WI978HbERHI4+ctlTNMZD3Ave/oGXGP6u24Tmw==" />

<add key="EncryptionKey" value="GSra2000" />

2. In visual stuido "appconfiguration.cs", i have written the below 

public static string KPISqlEntityCS
        {
            get
            {
                string constr = ConfigurationManager.AppSettings["KPISqlCS"];
                if (!string.IsNullOrEmpty(constr))
                    constr = new SecureAccessComponent.clsEncryption64().DecryptFromBase64String(constr, EncryptionKey);

                string conStrIntegratedSecurity = new System.Data.EntityClient.EntityConnectionStringBuilder
                {
                    Metadata = "res://*",
                    Provider = "System.Data.EntityClient", //i have tested with enityclient and sqlclient 

                      any one of these two

                    Provider = "System.Data.SqlClient",

                    ProviderConnectionString = constr,
                }.ConnectionString;

                return conStrIntegratedSecurity;

            }
        }

3. To get this sql connection string, i have written the below.

public static string GetSQLConnectionString()
        {
            A. string strConnectionString = "Data Source=ENAZSQLRSA;Initial Catalog =ENOCSSC_KPI;Integrated Security = true";
            B. string strConnectionString=AppConfiguration.KPISqlEntityCS;
            return strConnectionString;            

        }

in step 3, if i use A, i do not get any error, if i use B, i get the error "Error occurred, please contact the system administrator, keyword not supported - metadata"

Help would be highly appreciated.

Thanks in advance.

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Thanks Ramanjjilu Naidu