title: Crystal Reports error "Invalid object format name." for field objects
body: <p>I'm making a dynamic report using Crystal Reports and .NET C#. The content of the report is not fully known until run-time. 
  The report template only contains Formula Fields and a connection to the database table.
  At runtime I collect the wanted data collection, create a new reportDocument object and set the collection to the reports DataSource. Then I collect all field objects from the report template and loop through them, setting the data properties. This works fine as long as the properties is of type string, BUT when it is of type bool or double, it crashes with the following error: <strong>"Invalid object format name"</strong></p>
  
  <p>How can I set the data type of the field object to numeric/bool at runtime?</p>
  
  <p>Here's some code:</p>
  
  <pre><code>//Collecting data and setting data source
  for (int i = 0; i &lt; ColNumber; i++)
              {
                  //Fields 
  
                  var DbFieldName = mappingNames[i];
                  var fieldType = comparisonObj.GetFieldType(DbFieldName);
  
                  var fieldName = "Field" + (i + 1);
                  var ffld = report.DataDefinition.FormulaFields[fieldName];
                  if (ffld != null)
                  {
                      ffld.Text = "{" + aliasName + "." + DbFieldName + "}";                        
                  }
  
  
                  var fobj = report.ReportDefinition.ReportObjects[fieldName] as FieldObject;
                  if (fobj != null)
                  {
                      fobj.Left = CurrentLeft;
                      fobj.Width = FieldSpace * widths[i] / 100;
                      if (IsNumber(fieldType))
                      {
                          fobj.ObjectFormat.HorizontalAlignment = Alignment.RightAlign;
                          fobj.FieldFormat.NumericFormat.RoundingFormat = RoundingFormat.RoundToTen;
                      }
                      else if (IsBool(fieldType))
                      {
                          fobj.FieldFormat.BooleanFormat.OutputType = BooleanOutputType.YesOrNo;
                      }
  
                  }
  
                  //Headers
                  var ColumnHeaderName = headers[i];
                  var columnName = "Column" + (i + 1);
                  var tobj = report.ReportDefinition.ReportObjects[columnName] as TextObject;
                  if (tobj != null)
                  {
                      tobj.Text = ColumnHeaderName;
                      tobj.Left = CurrentLeft;
                      tobj.Width = FieldSpace * widths[i] / 100;
                      CurrentLeft = CurrentLeft + tobj.Width + blank;
                      if (IsNumber(fieldType))
                          tobj.ObjectFormat.HorizontalAlignment = Alignment.RightAlign;
                  }
  
              }
  </code></pre>