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Architect_Programmer_Code Agriculture Network»Architect › Programming › .Net/C # › Parametric query @macid nvarchar(50' requires parameter '@macid', but ...
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[Source] Parameterized query @macid nvarchar(50' requires parameter '@macid', but does not provide that...

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Posted on 10/10/2018 10:20:46 AM | | | |

Above is the table structure



Parameterized queries '(@username nvarchar(50), @address nvarchar(50), @macid nvarchar(50' require the parameter '@macid', but the parameter is not provided.


post data to the interface, if macid is empty, ado.net an error will be reported.

Solution:

DBNull.Value is used to represent null values in the data.







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