Get current SharePoint site URL in C#

Question

Hot to get current SharePoint site URL in Visual WebPart using C#?, I need to replace this URL with the current SharePoint Site URL? How I can do that?

using(SPSite oSite = new SPSite("http://test:1512")) {  
                using(SPWeb oWeb = oSite.RootWeb)   
                {  
                    SPList oList = oWeb.Lists["Employee"];  
                    SPListItem oSPListItem = oList.Items.Add();  
                    oSPListItem["EmployeID"] = txtEmployeeId.Text;  
                    oSPListItem["City"] = txtCity.Text;  
                    oSPListItem.Update();  
                }  
            }  

Answer 1

How to get the current site URL in SharePoint using C#?

In Visual WebPart, to get the current site URL in SharePoint Server using C#, you have to use SPContext.Current.Web.Url as the following:

string currentSiteURL = Microsoft.SharePoint.SPContext.Current.Web.Url;

Example:
If you added your Visual WebPart in a page (http://debug/site1/Pages/ContactUs.aspx) at a SubSite (http://debug/site1) under the SharePoint Root Site URL is http://debug/, the SPContext.Current.Web.Url will get the current subSite URL (http://debug/site1)

In your code, you have to use SPContext.Current.Web.Url as below

using(SPSite oSite = new SPSite(SPContext.Current.Web.Url)) {  
  using(SPWeb oWeb = oSite.Open())   
      {  
             //Your Code
       }  
   }  

See also, How to get Root site Collection URL in SharePoint using C#?