how to multiply day count and charges day wise and store value on label control

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C#

private void btnsearch_Click(object sender, EventArgs e)
        {
            SqlCommand cmd = new SqlCommand("select * from tbltransactioncustomer where RoomNum= '" + txtroomno.Text + "' and Status='Active' and Remark='CheckIn' ", con);
            con.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            txtadvancepayment.Enabled = false;
            if (dr.Read())
            {
                txtroomtype.Text = dr.GetValue(2).ToString();
                txtname.Text = dr.GetValue(3).ToString();
                txtage.Text = dr.GetValue(4).ToString();
                txtcheckindate.Text = dr.GetValue(9).ToString();
                txtadvancepayment.Text = dr.GetValue(13).ToString();
                
                txtcheckoutdate.Text = DateTime.Now.ToString ();
                lblperdaycharge.Text = dr.GetValue(14).ToString();
                // date calculation
                DateTime start = new DateTime();
                DateTime over = new DateTime();
                
                start = Convert .ToDateTime( txtcheckindate.Text);
                over =  Convert .ToDateTime(txtcheckoutdate.Text);
                TimeSpan datecalculation = over - start ;

                lblcountdays.Text = datecalculation.Days.ToString ();
                //----- date calculation end
  //------ Amount to be check   
  //*******************************  M geting error here ***********************************
// ******************************** can any one slove this  *********************************
        // here on multiplication [*] m getting error help me to solve this error please 
       // in vb.net this line of code works fine but in c# m getting error
     // lbldebitamount.Text = lblperdaycharge.Text * datecalculation.Days
    //operator * cannot be applied to operands of type 'string' and 'string' this is error  
               lbldebitamount.Text = lblperdaycharge.Text * lblcountdays .Text ;
            }
            con.Close();
        }

Posted 9-Mar-14 4:07am

Tarun Jaiswal

Updated 9-Mar-14 4:12am

Kornfeld Eliyahu Peter

v2

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SanSkun 9-Mar-14 11:23am

Hi,
May I know whats the error.

1 solution

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Peter Leow · Accepted Answer · 2014-03-09T05:21:00

You situation is similar to this:

C#

string perdaycharge = "12.35";
string countday = "2";
// error: Operator '*' cannot be applied to operands of type 'string' and 'string'
Decimal cost = perdaycharge * countday; // line 4

Line 4 will produce that error as it cannot multiply string and string, you have to parse the 2 strings to the respective number types before any arithmetic operation. Change line 4 as follows:

Decimal cost = Decimal.Parse(perdaycharge) * int.Parse(countday);

Apply this to your case.