How to work on calculation in ListView

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Hi,

I am new to c#. I am trying to let the application calculate the ["High"]-["Low"] for me when the data is printed on the ListView. Can someone provide some information how to work on it. Thank you.

********************My Project**********************

lv.Columns.Add("Price", 50, HorizontalAlignment.Right);
lv.Columns.Add ( "Date" , 80 , HorizontalAlignment.Right ) ;
lv.Columns.Add("High", 60, HorizontalAlignment.Right);
lv.Columns.Add("Low", 60, HorizontalAlignment.Right);
lv.Columns.Add("High-Low", 60, HorizontalAlignment.Right);
lv.Visible = true ;

OleDbDataReader reader ;
string strCommand = "SELECT * FROM myReport" ;
this.conConnection.Open ( ) OleDbCommand cmd = new OleDbCommand ( strCommand , conConnection ) ;
reader = cmd.ExecuteReader ( ) ;

while ( reader.Read ( ) )
{
ListViewItem li = new ListViewItem ( ) ;
li.SubItems.Clear ( ) ;
li.SubItems[0].Text = reader["Price"].ToString();
li.SubItems.Add(reader["Date"].ToString());
li.SubItems.Add(reader["High"].ToString());
li.SubItems.Add(reader["Low"].ToString());
li.SubItems.Add(reader["High"-"Low"].ToString());
lv.Items.Add ( li ) ;
}
********************************************

Posted 7-Apr-10 20:55pm

vennesschan

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Wayne Gaylard · Answer 1 · 2010-04-08T01:28:00

You can do it in your CommandText i.e

SQL

SELECT Price, Date, High, Low, (High - Low) AS Difference From myReport

then you can read the rows from your reader like this

li.SubItems.Add(reader["Price"].ToString();
li.SubItems.Add(reader["Date"].ToString();
li.SubItems.Add(reader["High"].ToString();
li.SubItems.Add(reader["Low"].ToString();
li.SubItems.Add(reader["Difference"].ToString();

although I think this is the wrong way to go about things. If I were you I would not store my data in the database as strings, instead I would use the appropriate data type and retrieve the data like this

li.SubItems.Add(reader.GetDecimal(0);
li.SubItems.Add(reader.GetDate(1); etc

This is obviously after you have checked that the reader is not returning any Null values.

Hope this helps

Nicholas Butler · Answer 2 · 2010-04-07T21:08:00

Solution 1

You have to get the two values and subtract those.

For example, if your values are of type int:

C#

int high = ( int ) reader[ "High" ];
int low  = ( int ) reader[ "Low" ];
int range = high - low;

li.SubItems.Add( range.ToString() );

Nick

Posted 7-Apr-10 21:08pm

Nicholas Butler