c# contains part of string

Question

So I have a list with Materiel-objects. In Materiel I have 15 get and set methods. I want to construct a search-method that loops all the objects in the list, and all of the variables in each Materiel-object. The looping part is easy enough, but I'm struggling with the string-contains-part. The search term could for instance be "acto", and I should get a hit for "Tractor". I have tried using the string-Contains class, but as far as I can figure out, it only checks the string beginning in position 0. So "Tra" gets a hit, but not "acto".

Is there any build in classes, or should I program one myself?

Sorry for the bad explanation.

My code. I see now that I get hits for the substring, but also other results :)

    protected void Button_search_Click(object sender, EventArgs e)
    {
        string searchTerm = TextBox1.Text.ToString().ToLower();

        TableRow row;
        TableCell cell;

        int rowNumber = 1;

        foreach (Materiell mat in allItems)
        {
            if (searchTerm.Contains(mat.itemID.ToString().ToLower()) ||
                searchTerm.Contains(mat.manufacturer.ToLower()) ||
                searchTerm.Contains(mat.model.ToLower()) ||
                searchTerm.Contains(mat.serialNo.ToLower()) ||
                searchTerm.Contains(mat.dateProd.ToString().ToLower()) ||
                searchTerm.Contains(mat.location.ToLower()) ||
                searchTerm.Contains(mat.mainCategory.ToLower()) ||
                searchTerm.Contains(mat.subCategory.ToLower()) ||
                searchTerm.Contains(mat.dateAcquired.ToString().ToLower()) ||
                searchTerm.Contains(mat.price.ToString().ToLower()) ||
                searchTerm.Contains(mat.ownerID.ToString().ToLower()) ||
                searchTerm.Contains(mat.extra.ToString().ToLower()) ||
                searchTerm.Contains(mat.textComment.ToLower()) ||
                searchTerm.Contains(mat.active.ToString().ToLower()))
            {
                row = new TableRow();
                row.ID = "row" + rowNumber.ToString();
                rowNumber++;

                cell = new TableCell();
                cell.Text = "<a href=\"#\" class=\"opendiv\">" + mat.itemID.ToString() + "</a>";
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.manufacturer.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.model.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.serialNo.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.dateProd.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.location.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.mainCategory.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.subCategory.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.dateAcquired.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.price.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.ownerID.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.extra.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.ownDefData.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.textComment.ToString();
                row.Cells.Add(cell);

                cell = new TableCell();
                cell.Text = mat.active.ToString();
                row.Cells.Add(cell);

                Table1.Rows.Add(row);
            }
        }
    }

Answer 1

"some string".Contains("str") will return true, are you having problems with case sesitivity?

If so you could use this:

public static bool Contains(this string source, string toCheck, StringComparison comp) {
  return source.IndexOf(toCheck, comp) >= 0;
}

string title = "STRING";
bool contains = title.Contains("string", StringComparison.OrdinalIgnoreCase);

(Taken from Case insensitive 'Contains(string)')