Issue Adding SharePoint lookup field in Visual Studio

Issue: Once defined a lookup field on Visual studio 2012, it will not work on sharepoint

Resolution:

In the property of the lookup field provide a relative URL "list/listname" instead of providing List Name

How to fire button click event on page load in asp.net automatically

Solution

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1. you can directly call your button click event like this.

    //btnSubmit is my asp.net button control's id
    btnSubmit_Click(btnSubmit,null);

2. or using jquery like this..

$(document).ready(function(){
   //Id of your button control either it is server  control or simple html control
   $("[id*='btnSubmit']").click();
});

3. if you want to call your button click event in your page load you can directly call like

protected void Page_Load(object sender, EventArgs e)
{
    //btnSubmit is my asp.net button control's id
    //It will fire each and every time your page load event is fire.
    btnSubmit_Click(btnSubmit,null);
}