What is Sys.WebForms.PageRequestManager class in ASP.Net

Question

Hi   On UpdatePanel Refresh    var prm  SysWebFormsPageRequestManagergetInstance    if prm  null         prmaddendRequestfunction sender e             if senderpostBackSettingspanelsToUpdate  null  what is the difference between above and   On UpdatePanel Refresh    var prm  SysWebFormsPageRequestManagergetInstance    if prm  null         prmaddendRequestfunction    what is the meaning of the below line if senderpostBackSettingspanelsToUpdate

AnandM · Accepted Answer

anvina saysMy confusion was in the funtionif you see my question is it ok not to pass sender e as parameters and just plain function  Yes you can use function without parameters but the issue you will be going to face is that you canrsquot access the properties and methods in that function like postBackSettings and etc sender and e are nothing but the object and event same as we have use in C and VBNetThey help you too distinguish between controls which were used to postback the page partiallyRefer below link for more detailhttpsforumsaspnett1903128aspxWhatsSysWebFormsPageRequestManager

AnandM · Answer

anvina saysso it is ok if i dont use the below  if senderpostBackSettingspanelsToUpdate  null not much dfference yes not much difference

What is Sys.WebForms.PageRequestManager class in ASP.Net

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