Please try this
code.
private void ReportColorSettings(ReportDocument report)
{
section =
(Sections)report.ReportDefinition.Sections;
for (int i = 0; i < section.Count; i++)
{
foreach (ReportObject r in section[i].ReportObjects)
{
if (r.Kind.ToString() == "FieldObject")
{
FieldObject f =
(FieldObject)r;
f.Color =
System.Drawing.Color.Blue;
}
if (r.Kind.ToString() == "TextObject")
{
TextObject t =
(TextObject)r;
t.Color =
System.Drawing.Color.Black;
}
}
}
}