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1 using System;
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2
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3 namespace BLToolkit.Validation
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4 {
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5 [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
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6 public class RequiredAttribute : ValidatorBaseAttribute
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7 {
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8 public RequiredAttribute()
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9 {
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10 }
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11
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12 public RequiredAttribute(string errorMessage)
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13 : base(errorMessage)
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14 {
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15 }
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16
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17 public override bool IsValid(ValidationContext context)
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18 {
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19 return context.IsNull(context) == false;
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20 }
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21
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22 public override string ErrorMessage
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23 {
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24 get { return base.ErrorMessage ?? "'{0}' is required."; }
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25 set { base.ErrorMessage = value; }
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26 }
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27 }
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28 }
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