DataGridView control add mouse selected ToolTip display total

[Csharp]
/// <Summary>
/// Select the sum of multiple rows in the DataGridView
/// </Summary>
/// <Param name = "myDataGridView"> the DataGridView control that requires the total display </param>
/// <Param name = "TooLar"> input ToolTip control. </param>
/// <Returns> </returns>
Public bool DataGridViewSum (DataGridView mydatagri, ToolTip TooLar)
{
If (myDataGridView. SelectedCells. Count <2)
{
TooLar. RemoveAll ();
Return false;
}
// If the selected cells are all and greater than: 10000, the total operation is not considered.
If (myDataGridView. SelectedCells. Count> 10000 & myDataGridView. SelectedCells. Count = myDataGridView. GetCellCount (maid. None ))
{
TooLar. RemoveAll ();
Return false;
}

DataSet DS = new DataSet ();
DataTable DtGroup = new DataTable ("DtGroup"); // Save the column name
System. Collections. ArrayList NameMaxLength = new System. Collections. ArrayList (); // Save the length of the column name in DT
System. Collections. ArrayList ValueMaxLength = new System. Collections. ArrayList (); // Save the length of the column name in DT
DataTable DT = new DataTable ("DT"); // Save the column name and Data
DtGroup. Columns. Add ("ColumnName", System. Type. GetType ("System. String"); // field name

DT. Columns. Add ("ColumnName", System. Type. GetType ("System. String"); // field name
DT. Columns. Add ("ColumnValue", System. Type. GetType ("System. Decimal"); // Field Value

Foreach (DataGridViewCell DC in myDataGridView. SelectedCells)
{
If (DC. ValueType. Name. ToLower () = "decimal" | DC. ValueType. Name. ToLower () = "int32 ")
{
DataRow DR;
DR = DT. NewRow ();
DR ["ColumnName"] = myDataGridView. Columns [DC. ColumnIndex]. Name;
If (DC. Value = null)
{
DR ["ColumnValue"] = 0;
}
Else
{
DR ["ColumnValue"] = DC. Value;
ValueMaxLength. Add (DC. Value. ToString (). Length );
}
DT. Rows. Add (DR );
// Check whether the column name is included in the existing DtColName.
If (DtGroup. Select ("ColumnName = '" + myDataGridView. Columns [DC. ColumnIndex]. Name + "'"). Length = 0)
{
DataRow DR1;
DR1 = DtGroup. NewRow ();
DR1 ["ColumnName"] = myDataGridView. Columns [DC. ColumnIndex]. Name;
DtGroup. Rows. Add (DR1 );
NameMaxLength. Add (myDataGridView. Columns [DC. ColumnIndex]. Name. Length );
}
}
}
DS. Tables. Add (DT );
DS. Tables. Add (DtGroup );

DataRelation dRelation = new DataRelation ("dRelation", DS. tables ["DtGroup"]. columns ["ColumnName"], DS. tables ["DT"]. columns ["ColumnName"]);
DS. Relations. Add (dRelation );
DtGroup. Columns. Add ("ColumnSum"). Expression = "sum (child (dRelation). ColumnValue )";
String decSum = DT. Compute ("sum (ColumnValue)", ""). ToString ();

NameMaxLength. Add ("Total:". Length );
ValueMaxLength. Add (decSum. Length );
DtGroup. AcceptChanges ();
String Tall = "";
NameMaxLength. Sort ();
ValueMaxLength. Sort ();
Int NameMaxLen = 0;
NameMaxLen = int. Parse (NameMaxLength [NameMaxLength. Count-1]. ToString ());
Int ValueMaxLen = 0;
ValueMaxLen = int. Parse (ValueMaxLength [ValueMaxLength. Count-1]. ToString ());
For (int I = 0; I <DtGroup. Rows. Count; I ++)
{
String strOneLine = "";
StrOneLine = (DtGroup. Rows [I] ["ColumnName"]. ToString () + ":"). PadRight (NameMaxLen + 1 ,'');
StrOneLine = strOneLine + DtGroup. Rows [I] ["ColumnSum"]. ToString (). PadLeft (ValueMaxLen ,'');
Tall = Tall + strOneLine + System. Environment. NewLine;
}
Tall = Tall + "Total:". PadRight (NameMaxLen + 1, '') + decSum. PadLeft (ValueMaxLen ,'');

MyDataGridView. ShowCellToolTips = false;
TooLar. ToolTipIcon = ToolTipIcon. Info;
TooLar. IsBalloon = true; // ball shape
TooLar. ToolTipTitle = "Mouse selected total information :";
TooLar. UseAnimation = true; // use the animation effect
TooLar. UseFading = true; // fade-in and fade-out effect
TooLar. BackColor = Color. Wheat; // specifies the background Color of the tooltip.
TooLar. AutoPopDelay = 10000; // display time
TooLar. RemoveAll ();
TooLar. SetToolTip (myDataGridView, Tall );
DT. Dispose ();
DtGroup. Dispose ();
DS. Dispose ();
GC. Collect ();
Return true;
}