Asp net updating database from dataset

As Gordon Linoff pointed out your sql statement is incorrect.

Now sometime we have a requirement like, some rows of that Data Set (having Data Table) may get Updated with new values and some may have been Deleted or there may be another possibility of Insertion of new row in that table.When i hit the save button, the text boxes revert back to their values from bwhen the page was loaded. When you concatenating two sql strings, you better add space at the end of first string or at the beginning of second string.In this section, you will add a button that enables client data changes to be saved back to the database.The following section will show you how to test updating, inserting, and deleting the data.

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Now for the sake of the simplicity we are not concentrating on UI part.

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