Passing parameters from Managed code to X++ in dataset

Get external arguments through the args objects

 public void init()  
 {  
 ;  
 super();  
 EPPersonalize::find(curuserid());  
 if (element.args() && element.args().dataset() == tablenum(EmplTable))  
 {  
 callerEmplTable = element.args().record();  
 emplId = callerEmplTable.EmplId;  
 }  
 }  
 protected void Page_Init(object sender, EventArgs e)  
 {  
 this.AxDataSource1.CreatingDataSetRun += new EventHandler(AxDataSource1_CreatingDataSetRun);  
 }  
 Set the param value to the event arugments   
 void AxDataSource1_CreatingDataSetRun(object sender, CreatingDataSetRunEventArgs e)  
 {  
 e.DataSetRunArgs.parm = "4000";  
 }  
 In AOT override or add method in the data set and use element.args().parm() to received the paramter   
 public void executeQuery()  
 {  
 QueryBuildRange custRange;  
 ;  
 custRange = SysQuery::findOrCreateRange(this.query().dataSourceNo(1), fieldnum(CustTable, AccountNum));  
 custRange.value(element.args().parm());  
 super();  
 }  
 You can also pass an Enum. For example  
 void AxDataSource1_CreatingDataSetRun(object sender, CreatingDataSetRunEventArgs e)  
 {  
 e.DataSetRunArgs.parmEnumType = EnumMetadata.EnumNum(this.AxSession, "EPFormAction");  
 e.DataSetRunArgs.parmEnum(2);  
 }  
 public void init()  
 {  
 super();  
 if (element.args().parmEnumType() == enumnum(EPFormAction) && element.args().parmEnum() == EPFormAction::CreateMode)  
 {  
 //do somethign here  
 }  
 }