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In ASP.NET we need to validate DropDownList controls. But validating the DropDownList control with RequiredFieldValidator is not a straight forward as validating a TextBox control with RequiredFieldValidator. It requires little extra work. Following are the steps for validating a  DropDownList  with  RequiredFieldValidator Step 1: Create a DropDownList control 1: < asp:DropDownList ID ="ddlFruit" runat ="server" Height ="22px" Width ="200px" > 2: < asp:ListItem > - Select - </ asp:ListItem > 3: < asp:ListItem > Apple </ asp:ListItem > 4: < asp:ListItem > Orange </ asp:ListItem > 5: < asp:ListItem > Banana </ asp:ListItem > 6: < asp:ListItem > Pineapple </ asp:ListItem > 7: </ asp:DropDownList > Step 2: Add a RequiredFieldValidator 1: < asp:RequiredFieldValidator ID ="rfvFruit" runat =&q