Enable RequiredField Validator if CheckBox is checked using C# and VB.Net in ASP.Net

Question

when i click on checkbox i should enable requiredfield for textbox else disable it

dharmendr · Accepted Answer

Hi  ajayajRefer below sampleltdivgt    ltaspCheckBox ID34chkPassport34 runat34server34 OnCheckedChanged34CheckedChanged34 AutoPostBack34true34 gt    ltaspTextBox runat34server34 ID34txtPassportNumber34 gt    ltaspRequiredFieldValidator ID34rfvPassportNumber34 ErrorMessage34Required34 ControlToValidate34txtPassportNumber34        runat34server34 Enabled34false34 ValidationGroup34o34 gt    ltbr gt    ltaspButton Text34Submit34 runat34server34 ValidationGroup34o34 OnClick34Submit34 gtltdivgtCprotected void CheckedChangedobject sender EventArgs e    if sender as CheckBoxChecked            rfvPassportNumberEnabled  true        else            rfvPassportNumberEnabled  false    protected void Submitobject sender EventArgs e    if PageIsValid            Do your task    VBNetProtected Sub CheckedChangedsender

Enable RequiredField Validator if CheckBox is checked using C# and VB.Net in ASP.Net

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