dynamic sql connection string from within CLR

trying to create a clr that writes a sql table to file as pipe delimited.

not tested output yet so not sure if it is working as hit a snag trying to create the connection string. I want it to be dynamic so it works out the connection string based on the sql server it is being executed from.

    using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Security;
using System.Security.Principal;
using Microsoft.SqlServer.Server;

public partial class CLR_uspExportToFiles
{
    [Microsoft.SqlServer.Server.SqlProcedure]
    public static void uspExportToFiles(string TableOrQuery, string Delimiter, int Debug, string FilePath, string Filename)
    {
        var output = FilePath + Filename;
        using (System.IO.StreamWriter file = new System.IO.StreamWriter(output))
        {

            const string DATASOURCE = "Data Source=";
            const string INITIALCATALOG = ";Initial Catalog=";
            const string INTEGRATEDSECURITY = ";Integrated Security=True;Enlist=false;";

            string ConnString;
            string InstanceName;
            string DbName;

            //Establish a connection in the current context to dynamically get the current
            //Server and Database Name.
            using (SqlConnection sysconn = new SqlConnection("context connection=true"))
            {
                SqlCommand GetSQLSystemProperties = new SqlCommand();
                GetSQLSystemProperties.Connection = sysconn;

                sysconn.Open();

                //Get the current SQL Server instance name
                GetSQLSystemProperties.CommandText = "SELECT @@Servername";
                InstanceName = (string)GetSQLSystemProperties.ExecuteScalar();

                //Get the current Database Name
                GetSQLSystemProperties.CommandText = "SELECT DB_NAME()";
                DbName = (string)GetSQLSystemProperties.ExecuteScalar();
                sysconn.Close();


                //Dynamically construct the connection string to establish a connection outside
                //of the current context, so that any error written to the error table won't be
                //rolled back.
                ConnString = DATASOURCE + InstanceName + INITIALCATALOG + DbName + INTEGRATEDSECURITY;

                using (SqlConnection conn = new SqlConnection(ConnString))
                {

                    using (SqlCommand cmd = new SqlCommand("SELECT * FROM @TableOrQuery", conn))
                    {
                        //cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Parameters.AddWithValue("@TableOrQuery", TableOrQuery);
                        //cmd.Parameters.AddWithValue("@Del", Delimiter);
                        //cmd.Parameters.AddWithValue("@Debug", Debug);
                        //cmd.Parameters.AddWithValue("@FilePath", FilePath);
                        //cmd.Parameters.AddWithValue("@Filename", Filename);

                        using (SqlDataAdapter sda = new SqlDataAdapter())
                        {
                            sda.SelectCommand = cmd;
                            using (DataTable dt = new DataTable())
                            {
                                sda.Fill(dt);
                                //Build the Text file data.
                                string txt = string.Empty;

                                foreach (DataColumn column in dt.Columns)
                                {
                                    //Add the Header row for Text file.
                                    txt += column.ColumnName + "|";
                                }

                                //Add new line.
                                txt += "\r\n";
                                file.WriteLine(txt);
                                foreach (DataRow row in dt.Rows)
                                {
                                    foreach (DataColumn column in dt.Columns)
                                    {
                                        //Add the Data rows.
                                        txt += row[column.ColumnName].ToString() + "|";
                                    }

                                    //Add new line.
                                    txt += "\r\n";
                                    file.WriteLine(txt);
                                }

                            }

                        }
                    };

                }
            }
        }
    }
}

Getting an error though

Msg 6522, Level 16, State 1, Procedure CLR_uspExportToFiles, Line 0
A .NET Framework error occurred during execution of user-defined routine or aggregate "CLR_uspExportToFiles": 
System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
System.Data.SqlClient.SqlException: 
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover, SqlAuthenticationMethod authType)
   at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
   at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
   at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePa...

and not sure how to fix