Pass null value as parameter in DataSet

Question

I have fill method to get data from DB to dataSet that is like

Select * from table 
where (columnName = @parameter) OR (@parameter is null)

and in CS, its like

tableadapterObject.Fill(datasetObj.tableName, @parameter)

that works fine, but when I try to pass null

tableadapterObject.Fill(datasetObj.tableName, null)

It gives error.. {"Value cannot be null.\\r\\nParameter name: columnName"}

How could I Pass null value to parameter?? Any kind of help will be appreciated.

Answer 1

• Go to the dataset designer to this table-adapter
• click on the properties of this query
• click on the Parameters
• change Allow DbNull from false to true .

(german IDE and other parameter, but you should understand what i mean)

Answer 2

Change the property "AllowDBNull" to true. Please refer the below link.

http://msdn.microsoft.com/en-us/library/ms233762.aspx