DBCViewer.MainForm.dataGridView1_CellToolTipTextNeeded C# (CSharp) Method

        private void dataGridView1_CellToolTipTextNeeded(object sender, DataGridViewCellToolTipTextNeededEventArgs e)
        {
            if (e.ColumnIndex == -1 || e.RowIndex == -1 || e.RowIndex >= m_dataTable.Rows.Count)
                return;

            ulong val = 0;

            Type dataType = m_dataTable.Columns[e.ColumnIndex].DataType;
            CultureInfo culture = CultureInfo.InvariantCulture;
            object value = dataGridView1[e.ColumnIndex, e.RowIndex].Value;

            if (dataType != typeof(string))
            {
                if (dataType == typeof(sbyte))
                    val = (ulong)Convert.ToSByte(value, culture);
                else if (dataType == typeof(byte))
                    val = Convert.ToByte(value, culture);
                else if (dataType == typeof(short))
                    val = (ulong)Convert.ToInt16(value, culture);
                else if (dataType == typeof(ushort))
                    val = Convert.ToUInt16(value, culture);
                else if (dataType == typeof(int))
                    val = (ulong)Convert.ToInt32(value, culture);
                else if (dataType == typeof(uint))
                    val = Convert.ToUInt32(value, culture);
                else if (dataType == typeof(long))
                    val = (ulong)Convert.ToInt64(value, culture);
                else if (dataType == typeof(ulong))
                    val = Convert.ToUInt64(value, culture);
                else if (dataType == typeof(float))
                    val = BitConverter.ToUInt32(BitConverter.GetBytes((float)value), 0);
                else if (dataType == typeof(double))
                    val = BitConverter.ToUInt64(BitConverter.GetBytes((double)value), 0);
                else
                    val = Convert.ToUInt32(value, culture);
            }
            else
            {
                if (m_dbreader.StringTable != null)
                    val = (uint)m_dbreader.StringTable.Where(kv => string.Compare(kv.Value, (string)value, StringComparison.Ordinal) == 0).Select(kv => kv.Key).FirstOrDefault();
            }

            StringBuilder sb = new StringBuilder();
            sb.AppendFormatLine(culture, "Integer: {0:D}", val);
            sb.AppendFormatLine(new BinaryFormatter(), "HEX: {0:X}", val);
            sb.AppendFormatLine(new BinaryFormatter(), "BIN: {0:B}", val);
            sb.AppendFormatLine(culture, "Float: {0}", BitConverter.ToSingle(BitConverter.GetBytes(val), 0));
            sb.AppendFormatLine(culture, "Double: {0}", BitConverter.ToDouble(BitConverter.GetBytes(val), 0));

            string strValue;
            if (m_dbreader.StringTable != null && m_dbreader.StringTable.TryGetValue((int)val, out strValue))
            {
                sb.AppendFormatLine(culture, "String: {0}", strValue);
            }
            else
            {
                sb.AppendFormatLine(culture, "String: <empty>");
            }

            e.ToolTipText = sb.ToString();
        }