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today Iamp;#39;ll teach you how to perform server side validation for Indian pan card number in each product MVC so letamp;#39;s start so the very first thing Iamp;#39;ll open solution Explorer and from there Iamp;#39;ll be opening the model class now inside the class I am adding a namespace called system.componentmodel.data annotations this particular namespace is required for data annotations here Iamp;#39;ll be adding one single property called pan number which will be a string property at present I am adding a data annotation display and I am setting the name for it as you can see I am adding a data annotation required and I am setting the error message for it this particular data annotation is used for performing required validations it is very similar to required fillable editor now I am decorating the property with a regular expression data annotation attribute this particular attribute will be set with two parameters the first parameter is the regular expression wh