Unrecognized database format

I am trying to connect to a Access database.  I have setup in advance a Access db called "ToAccess.mdb".  It has 4 columns: id, col1, col2 and col3.  I want to populate it with the partial program below. 

In Visual Studio 2013 I have setup in web.config this excerpt:

<connectionStrings><add name="Accessdb" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\User\Documents\a Access\ToAccess.mdb;Persist Security Info=False;" />  </connectionStrings>

In Server Explorer>Data Connections>Add Connection... I selected Data Source:

Microsoft Access Database File (OLE DB)

I went to my Access file: "C:\Users\User\Documents\a Access\ToAccess.mdb"

Here is my code:

                                String connStr1 = ConfigurationManager.ConnectionStrings["Accessdb"].ConnectionString;
                                String cmdStr1 = "INSERT INTO [TableAccess] (col1,col2,col3) VALUES (@col1,@col2,@col3);";
                                try
                                {
                                    using (OleDbConnection conn1 = new OleDbConnection(connStr1))
                                    {
                                        using (OleDbCommand cmd1 = new OleDbCommand(cmdStr1, conn1))
                                        {
                                            conn1.Open();
                                            cmd1.Parameters.AddWithValue("@col1", dr[1]);
                                            cmd1.Parameters.AddWithValue("@col2", dr[2]);
                                            cmd1.Parameters.AddWithValue("@col3", dr[3]);
                                            cmd1.ExecuteNonQuery();
                                            conn1.Close();
                                            cmd1.Dispose();
                                            conn1.Dispose();
                                        }
                                    }
                                }
                                catch (Exception ex)
                                {
                                    Label2.Text = "Insert Into: " + ex.ToString();
                                }

Error code:

Insert Into: System.InvalidOperationException: The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.   at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapper)   at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)   at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)   at System.Data.ProviderBase.DbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)   at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions)   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)   at System.Data.ProviderBase.DbConnectionInternal.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)   at System.Data.OleDb.OleDbConnection.Open()   at MDFtoAccess._Default.Button1_Click(Object sender, EventArgs e) in c:\Users\John\Documents\a  ASP.net\csharp\a MDF and Microsoft Office\MDFtoAccess\MDFtoAccess\Default.aspx.cs:line 43