Bind List Items to DataGrid

SPWeb oWebsite = SPContext.Current.Web;
SPList oList = oWebsite.Lists["List_Name"];
SPListItemCollection collListItems = oList.Items;

DataGrid1.DataSource = collListItems.GetDataTable();
DataGrid1.DataBind();

Reference: https://msdn.microsoft.com/en-us/library/microsoft.sharepoint.

splistitemcollection.getdatatable.aspx