Get data from Gridview

[dawsonz]

Hello

I'm trying to take Data from my GridView at the moment.

My gridview has a column called 'DataField' what I want to do is take those values from Datafield to calculate the highest value.

The 'Datafield' are as follows: A10, A11, A12 etc.

How can I take those values (A10, A11, A12) and place them into a textbox, or calculate the highest value and put that into a textbox.

My c# code for the DataBind is below:

void binddata()
    {
        DataSet ds = new DataSet();
        ds.ReadXml(Server.MapPath(@"xml\" + Request["Gradebook"] + ".xml"));
        foreach (DataColumn dc in ds.Tables[0].Columns)
        {
            dc.ColumnMapping = MappingType.Attribute;
        }

         DataView dv = new DataView(ds.Tables[0]);

         dv.Sort = "SortOrder ASC";

        gv.DataSource = dv;
        gv.DataBind();

Many thanks!