Append a row in existing dataview in ASP.NET

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I have a asp.net page with User picker control which can take more than one names and filter out on click of Filter button for those particular entered names in UserPicker but it is filtering out one by one using dataview in the below code , I have a written the code but while looping it is taking the last name and displaying the records.

In this case how to Append a row for the given existing dataview.

What I have tried:

IEnumerator users = UserPicker.ResolvedEntities.GetEnumerator();
              while (users.MoveNext())
              {
                  SPUser selectedUser = web.EnsureUser(((Microsoft.SharePoint.WebControls.PickerEntity)(users.Current)).Key);
                  string strVendorUserName = selectedUser.LoginName.ToString();

                  if (strVendorUserName != null || ddlPermissionType.SelectedItem != null)
                  {
                      StringBuilder sb = new StringBuilder(string.Format("UserLoginName = '{0}'", strVendorUserName.Trim()));

                      dv.RowFilter = sb.ToString();

                      return dv;


                  }

Posted 4-Sep-17 20:49pm

jags@212

Updated 5-Sep-17 6:57am

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Richard Deeming · Answer 1 · 2017-09-05T06:57:00

Declare the StringBuilder class before the while loop. Combine multiple filters with OR. Assign the RowFilter and return the result after the while loop.

You should also be able to use a foreach loop, rather than working directly with the IEnumerator interface.

C#

var sb = new StringBuilder();

foreach (Microsoft.SharePoint.WebControls.PickerEntity item in UserPicker.ResolvedEntities)
{
    SPUser selectedUser = web.EnsureUser(item.Key);
    string strVendorUserName = selectedUser.LoginName;
    if (strVendorUserName != null || ddlPermissionType.SelectedItem != null)
    {
        if (sb.Length != 0) sb.Append(" OR ");
        sb.AppendFormat("UserLoginName = '{0}'", strVendorUserName.Trim()); // <-- Possible NullReferenceException here!
    }
}

dv.RowFilter = sb.ToString();
return dv;

NB: Looking at your if block, you believe that LoginName could return null. But if it does, and ddlPermissionType.SelectedItem is not null, then strVendorUserName.Trim() will fail with a NullReferenceException.