Textinput form field in word not displaying after insertion through code

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C#3.5

Hi friends,

I have a template word file need to create with output data. In myword file i having textinput field and checkbox. I written a code for formfield textinput field to insert data.But thats not working in the output file showing field code changed message. please find below code and do let me know any further things i need to do.

if (formField.Type == Microsoft.Office.Interop.Word.WdFieldType.wdFieldFormTextInput)
           {
               string val = formField.TextInput.Default;
               if (objectval != "")
               {
                   if (val == "")
                   {

                       formField.TextInput.Default = objectval;

                   }
               }
               return "Find";
           }