modify database in connection string

Sir actually iam a new bee in .Net

iam unable to understand the process flow and i see u r adding a connection string after that modifying it

iam adding a connection string in one page and changing it in another page.

since iam using code before iam loging into application i want to change the databse after i log into application .. since i cant use sessions becouse i may change it after a long time.

i need to get the server details from my connnection string and change the database.

so please can u help me in modifying the connection string ... using this code.

Example :

Dim connectionStringBuilder As New SqlConnectionStringBuilder()

            Dim connectionStringBuilder1 As New SqlConnectionStringBuilder()

            'Creating New  Connection String  from User Interface !!!

            'Using SQL Authentication

            connectionStringBuilder.DataSource = server1

            connectionStringBuilder.UserID = uid

            connectionStringBuilder.Password = pwd

            connectionStringBuilder.InitialCatalog = dbname1

            'ConnectionString property will give us the final connection string

            '  connectionStringBuilder.ConnectionString

            connectionStringBuilder1.DataSource = server1

            connectionStringBuilder1.UserID = uid

            connectionStringBuilder1.Password = pwd

            connectionStringBuilder1.InitialCatalog = "master"

            Dim connectionStringBuilder2 As New SqlConnectionStringBuilder()

            connectionStringBuilder2.DataSource = server1

            connectionStringBuilder2.UserID = uid

            connectionStringBuilder2.Password = pwd

            connectionStringBuilder2.InitialCatalog = dbname2

            'Dim connections As ConnectionStringsSection = DirectCast(cfg.GetSection("connectionStrings"), ConnectionStringsSection)

            If connections.ConnectionStrings("SoftAssetMgmtConnectionString") Is Nothing Then

                connections.ConnectionStrings.Add(New ConnectionStringSettings("SoftAssetMgmtConnectionString", connectionStringBuilder.ConnectionString))

                connections.ConnectionStrings.Add(New ConnectionStringSettings("mastersam", connectionStringBuilder1.ConnectionString))

                connections.ConnectionStrings.Add(New ConnectionStringSettings("2databaseconstring", connectionStringBuilder2.ConnectionString))

            Else

                connections.ConnectionStrings.Remove("SoftAssetMgmtConnectionString")

                connections.ConnectionStrings.Remove("mastersam")

                connections.ConnectionStrings.Remove("2databaseconstring")

                connections.ConnectionStrings.Add(New ConnectionStringSettings("SoftAssetMgmtConnectionString", connectionStringBuilder.ConnectionString))

                connections.ConnectionStrings.Add(New ConnectionStringSettings("mastersam", connectionStringBuilder1.ConnectionString))

                connections.ConnectionStrings.Add(New ConnectionStringSettings("2databaseconstring", connectionStringBuilder2.ConnectionString))

            End If

            webConfiguration.Save()

            ConfigurationManager.RefreshSection("ConnectionStrings")