Count Max Value in DataTable(DataGrid)

If you want the total number of columns use:

DataTable.Columns.Count();

If you want the max value for a column you can use this:

  DataTable myDataTable = new DataTable();
            myDataTable.Columns.Add("amount");
            myDataTable.Columns["amount"].DataType=typeof(decimal);
            DataRow row1 = myDataTable.NewRow();
            row1["amount"] = 5.0;
            myDataTable.Rows.Add(row1);
            DataRow row2 = myDataTable.NewRow();
            row2["amount"] = 9.0;
            myDataTable.Rows.Add(row2);

            //int totalColumns = myDataTable.Columns.Count;

            
            decimal maxamount = (Decimal)myDataTable.AsEnumerable().Max(row => row["amount"]);

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