CODEWITHSUNDEEP
c#asp.net
Rizwan
Rizwan

Reputation: 9

Discount Calculations in Asp Dot Net

In my gridview i am having sellprice,quantity,discount,netamount. the user enters the quantity and discount and the result should be displayed in the netamount column, i am trying with this code it is not working and the last line i am substracting the value it is giving error please help me to solve the problem..... I am writing this code in the Text changed event .....

foreach (GridViewRow row in GridView1.Rows)
    {
        TextBox txtSerAmt = (TextBox)row.FindControl("TxtServiceAmount");
        TextBox txtQuantity = (TextBox)row.FindControl("txtQuantity");
        TextBox txtdsAmount = (TextBox)row.FindControl("txtdsAmount");
        TextBox TxtNetAmt = (TextBox)row.FindControl("TxtNetAmt");

        if (txtSerAmt != null && txtQuantity != null && txtdsAmount != null)
        {
           TxtNetAmt.Text = (((
           Convert.ToDouble(txtSerAmt.Text) * Convert.ToDouble(txtQuantity.Text))) * Convert.ToDouble(txtdsAmount.Text)/100).ToString();
        }
         txttotal.text = Convert.ToDouble(txtTotal.Text) - Convert.ToDouble(txtNetAmt.Text)
    }

Upvotes: 0

Views: 1813

Answers (3)

Rajamohan Anguchamy
Rajamohan Anguchamy

Reputation: 1736

in string to double conversion first you check that the getting value not for null. if null means to putting manually '0' are otherwise, it should rises error and anther one thing after subtracting to most to convert to string like "Masoomian" answer 

TextBox TxtNetAmt = (TextBox)row.FindControl("TxtNetAmt");

txttotal.text = (Convert.ToDouble(txtTotal.Text) - 
Convert.ToDouble(txtNetAmt.Text)).ToString();

and you should check all the FindControl, the control id is correct. and this calculation only do in Rowbound Event

Upvotes: 0

Nazmul
Nazmul

Reputation: 7218

Closely observe the last line: there are txttotal and txtTotal, as well as txtNetAmt is mentioned as TxtNetAmt in earlier line.

There are some spelling differences.

 **txttotal**.text = Convert.ToDouble(**txtTotal**.Text) - Convert.ToDouble(**txtNetAmt**.Text)

Upvotes: 0

Masoomian
Masoomian

Reputation: 752

txttotal.text = (Convert.ToDouble(txtTotal.Text) - Convert.ToDouble(txtNetAmt.Text)).ToString()

The reason why you are getting the error is txttotal.text is a string type where your calculation returns a number type.So you need to convert to string which is performed by the ToString method

Upvotes: 1

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