Read Web.Config Key

// Read Web.Config Key from server end in C#

// add Key in Web.Config after ending:   </connectionStrings> tag
<appSettings>	
	  <add key="FileUploadedPath" value="~/PurchaseCSDocument/" />
		<add key="LiscenseExpireDate" value="2023-01-15" />
	</appSettings>
	
	// Declare global Variable in server end(controller or handler) & get value
	 private string LiscenseExpireDate = Convert.ToString(ConfigurationManager.AppSettings["LiscenseExpireDate"]);
	  var q = new { DashboardLogin = oDashboardLogin, 
	                EmpCases = list_HRMS_Disciplinary_Case_T, 
	                LiscenseExpireDate = LiscenseExpireDate }; /// Passing value to js