Vb net datagridview not updating
The Display Member is the name of the member of the bound objects to display in the control.The Value Member is the name of the member of the bound objects whose value should be returned by the control's Selected Value property.as i said, an exit and restart of the app displays the accurate data....i can't figure this out for the life of me. All the Refresh method of any control does is redraw it on-screen. If the binding hasn't been updated then redrawing it will have no effect.
The Data Source is the list containing the data to bind.the combobox properties being used are data source, display member and valuemember - I'm still very green at this but also noticed a plus sign entitled 'databindings' above combobox name, but all are blank - will begin researching what those are all about next....You wouldn't use the Data Bindings property at all.Update will save the changes in the Data Table to the database but those changes should already be reflected in the Combo Box because they're already in the Data Table. When you call Fill on a Data Adapter or Table Adapter you are populating a Data Table.I think you need to explain more clearly exactly what you're trying to do, how you're trying to do it, what you expect to happen and what does happen. | MSDN Data Walkthroughs VBForums Database Development FAQ My Code Bank Submissions: VB | C# My Blog: Data Among Multiple Forms (3 parts) Beginner Tutorials: VB | C# | SQL thanks for the databindings heads up - you saved me several hours of googling I'm sure..... Even if you pass a Data Set as an argument, you are populating one of the Data Tables in its Tables collection.You can either assign the Data Table to the Binding Source's Data Source property or else assign a Data Set to the Data Source and then the name of the Data Table to the Data Member. A Data Set is essentially an in-memory representation of a database.The Binding Source then gets assigned to the Combo Box's Data Source. A Data Table is basically an in-memory representation of a database table.Many people don't understand this and find themselves wondering why all of their data dissapeared. Chances are the people who originally asked the question are using table adapters (as in ADO. People make the mistake of adding the data to the table adapter, then can't see it on the dataset because they didn't perform a fill method. [combobox] datasource = Proflow1Dat Set Binding Source Display member = name Bindingsource [underneath the form] = Bindingsource = Proflow1Dat Set Binding Source [Proflow1Dat Set Binding Source] Datasource = Pro Flow1Data Set Datamember = orificedata Form1 load code You don't have a problem at all.Another thing that happens is that someone changes the dataset, then doesn't write the the information back to the database. The post was never really properly addressed, but you guys are sure to jump on someone adding input. You simply have two copies of the data from the database.the short version (or at least as short as I can make it, so forgive the excessive verbiage) is as follows: - created a sql2005 express database with a table called currency in it - fields are Currency, Rate, As_of - i call a public function named getexchangerate() that hits yahoo finance and grabs the exchange rate file for that particular currency and time of day and parses the values in to their respective pieces that correspond with the above fields in currency - i fire up a connection to the database and call the transact-sql update command using the values retrieved above - the table updates with the values successfully - i launch form1 which contains a combobx entitled Exchange_CB - it's display value is Currency, It's value item is Rate - also, as a sidebar....i have a string i pass from the getexchangerate function that updates a label that contains all of the retrieved values - this also works correctly on form load (and is how i discovered the update wasn't happening on the comboboxes selectedvalue) - when i dropdown and change the combobox, in this case from CDN to USD, the previous valuemember is displayed (ie from the last successful download) - i exit the app and go back in, and change it again and it's correct. When you call Update on a Data Adapter or Table Adapter you are saving changes from a Data Table.Logic seems to tell me that my call to refresh the data is happening before the adapter is filled, but of course i don't know at this point and hence this posting.... Even if you pass a Data Set as an argument, you are saving changes from one of the Data Tables in its Tables collection.