How to get rid of “No value given for one or more required parameters”

Question

I have the following code,

When the update button in Gridview is clicked , it throws an error: No value given for one or more required parameters

Answer 1

If you look at the below link, under Remarks it says "A common way to use these collections is to HTML-encode the values supplied by the user before they are stored in the data source."

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.rowupdating.aspx

Answer 2

From OleDbCommand.Parameters:

The OLE DB .NET Provider does not support named parameters for passing parameters to an SQL statement or a stored procedure called by an OleDbCommand when CommandType is set to Text. In this case, the question mark (?) placeholder must be used. For example:

SELECT * FROM Customers WHERE CustomerID = ?

So try using unnamed parameters instead (see the documentation for a full example).