C# : "SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects"

C# : "SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects"

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C# : System.InvalidCastException: 'The SqlParameterCollection only accepts non-null SqlParameter typ
C# : System.InvalidCastException: 'The SqlParameterCollection only accepts non-null SqlParameter typ
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