Canguro.Commands.Forms.SectionsGUI.UpdateMaterialsComboBox C# (CSharp) Method

        private void UpdateMaterialsComboBox()
        {
            materialComboBox.Items.Clear();
            int i = 0;
            List<string> validMaterials = new List<string>(new string[] { "SteelDesignProps", "ConcreteDesignProps" });
            foreach (Material mat in MaterialManager.Instance.Materials)
            {
                if (validMaterials.Contains(mat.DesignProperties.GetType().Name))
                {
                    materialComboBox.Items.Add(mat.Name);
                    if (mat == currentMaterial)
                        materialComboBox.SelectedIndex = i;
                    i++;
                }
            }

            if (materialComboBox.SelectedItem == null)
                materialComboBox.SelectedIndex = 0;
        }