Updating detailsview not working
The Keys dictionary contains the names and values of fields that uniquely identify the record to update or delete, and always contains the original values of the key fields before the record was edited. The edit button is replaced with buttons that allow the user to save changes or cancel editing a row. You can customize which fields are bound to the DetailsView control by setting the AutoGenerateRows property to false and specifying a BoundField control for each field that you want displayed in the DetailsView control. When the ReadOnly property is true, the bound field will be displayed, but the user will not be able to edit the field. If the InsertVisible property is false, then the bound field will not be displayed when the user clicks the New command button.
After an update, the DetailsView control raises its ItemUpdated event. The data source control uses the values from the Keys, Values, NewValues, and OldValues dictionaries as parameters for its insert, update, or delete command. This event allows you to perform post-update logic, such as integrity checks. By default, the row is added to the bottom of the DetailsView control. After the update is complete and all events have been raised, the DetailsView control rebinds to the data source control to display the updated data. The OldValues dictionary contains any original values of fields except the key fields, which are included in the Keys dictionary. When the DetailsView control is performing an insert operation, it passes the values to be inserted in the data source using the Values dictionary collection. Note The original primary key values for the fields specified in the DataKeyNames property are stored in view state. You can specify whether a bound field is editable using the ReadOnly property of the BoundField control. If your primary key values contain sensitive information, you should encrypt the view state contents by setting the page's ViewStateEncryptionMode property to Always. When the user clicks a command button, the DetailsView control redisplays the row with controls that allow users to modify the contents of the row. Typically, an editable view displays an additional row that contains command buttons with the text Edit, Insert, and Delete. Similarly, you can specify whether a value can be inserted for a bound field using the InsertVisible property of the BoundField control. The Keys dictionary contains the names and values of fields that uniquely identify the record to update or delete, and always contains the original values of the key fields before the record was edited. You can access each dictionary using the event arguments passed to the insert, update, or delete events raised by the DetailsView control. When the ReadOnly property is true, the bound field will be displayed, but the user will not be able to edit the field. You can customize the input control displayed in edit mode by using a TemplateField. Similarly, the DetailsView control raises its ItemInserted event after an insert and its ItemDeleted event after a delete. This is especially useful when the bound field is automatically generated by the data source, such as a date and time stamp or an auto-incrementing primary key. If the InsertVisible property is false, then the bound field will not be displayed when the user clicks the New command button. You can then add individual CommandField objects for a row. For example, to place the current displayed row into edit mode, you can add a CommandField field with the ShowEditButton property set to true. For information on how data source control parameters are created based on the dictionaries created for bound values, see Using Parameters with Data Source Controls for Inserting and Updating. Boolean data is displayed using check boxes. When the ReadOnly property is set to false, the field will be editable when the user clicks the Edit command button. The Values and NewValues dictionaries contain the current values from the input controls in the record being inserted or edited, respectively. The edit button is replaced with buttons that allow the user to save changes or cancel editing a row.
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