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IDataParameter.IsNullable Property

Gets a value indicating whether the parameter accepts null values.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)

bool IsNullable { get; }

Property Value

Type: System.Boolean
true if null values are accepted; otherwise, false. The default is false.

Null values are handled using the DBNull class.

The following example creates an instance of the implementing class, SqlParameter, and sets some of its properties.

    private static void AddSqlParameter(SqlCommand command, 
        string paramValue)
    {
        SqlParameter parameter = new SqlParameter(
            "@Description", SqlDbType.VarChar);
        parameter.Value = paramValue;
        parameter.IsNullable = true;
        command.Parameters.Add(parameter);
    }

private static void SetParameterToNull(IDataParameter parameter)
{
    if (parameter.IsNullable)
    {
        parameter.Value = DBNull.Value;
    }
    else
    {
        throw new ArgumentException("Parameter provided is not nullable", "parameter");
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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