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We use the Row Updating event of Grid View to update the record in the database table.We get the Id value using the row index and another Text Box value is also retrieved.Create SQL Connection We need a connection with a Microsoft SQL Server database so we can access data and perform an operation on it.We define a connection in the web.config file and give a name to the connection string.Database Table Structure We are using an "EMPLOYEE" table so the "EMPLOYEE" table design is: Design of Grid View We design a Grid View with which we can perform update and delete operations.Here we can update Name, Emp_Code and Emp_Age fields depending on the Id field of the "EMPLOYEE" table.
So first we need to move to an updateable row record in the Text Box. Now, write the same code above in Calculate Values and loop thru each row in the Grid View.... Since you want the value in the Text Box3 and the Total Text Box to be changed as soon as you change the value in the first two textboxes, set Auto Post Back to true and implement a Text Changed event handler for both the first two Text Boxes, and point them both to the same event....... For decimal columns, you can use simple arithmetic operators like ' ' and '*'. Expression = "Units On Order * Unit Price" An expression is evaluated to a value by combining values from multiple cells of the same row and aggregates on the columns using the provided operators.