first you create stylesheet for a web page. simply, drag and drop stylesheet under page section in asp.net's all controls has class or cssClass attribut. which stylesheets class you want to use you write their name under class or cssClass.

which database you are using? if using sql: then when you write insert statment where you are passing vlues of that columns you must pass under [dfdf] if you are using oracle this is not possible from user side. you must use regular expression to avoid apostrophy.

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if validation button is outside the grid. You simply write code on button click event. for(int i=0;i

Use summary validator. but all requiredfieldvalidator's mode should be none