Workflow error in VS2010

i m trying to run an example of microsoft workflow software. I get the following error in a line:

wsh.Description.Behaviors.Add(开发者_开发问答new SqlWorkflowInstanceStoreBehavior(ApprovalProcessDBConnectionString));
        WorkflowIdleBehavior wib = new WorkflowIdleBehavior();
        wib.TimeToUnload = new TimeSpan(0, 0, 2);
        wsh.Description.Behaviors.Add(wib);

        wsh.Open(); <-- error: The InstanceStore could not be initialized.

Can anyone help me?

Sounds like you need to run a couple of queries to set up an InstanceStore in your database.

Look for:

SqlWorkflowInstanceStoreSchema.sql
SqlWorkflowInstanceStoreLogic.sql

in the folder:

%WINDIR%\Microsoft.NET\Framework\v4.xxx\SQL\EN

Just run those two queries on whatever database you're connecting to via your ApprovalProcessDBConnectionString.