The variable name ‘x’ has already been declared. Variable names must be unique within a query batch or stored procedure.

The above error can result if you bound SQLDataSource to Formview ( or Gridivew – did not try GridView myself) where you are reusing a declare variable. For example you want to insert startDate and EndDate and all want to enter the difference of the two, you would so the following in SQL

[sql]
Insert into mytable (startDate,EndDate,TotalDays)
values (@StartDate,@EndDate,datediff(d,@starDate,@EndDate))
[/sql]

You will get the above error because you are using @StartDate twice in the query. Also you are using @EndDateTwice in the query. To temporarily resolve the error, simply use an integer number in place of DateDiff function and the query will work.

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