Object reference not set to an instance of an object.

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Can Anyone Rectify Below Error:

i D't know how to rectify please rectify...

Error:

Object reference not set to an instance of an object.

Error Coding:

C#

public void totalprice()
   {
       float rowtotal = 0;
       float subtotal = 0;
       float totalprice = 0;
       foreach (GridViewRow row in GridView1.Rows)
       {
           int pro_id = Convert.ToInt32(GridView1.DataKeys[row.RowIndex][0]);
           int quantity = Convert.ToInt32((row.FindControl("txtquantity") as TextBox).Text);// Error
           float price = float.Parse((row.FindControl("price")).ToString()); // Error
           rowtotal =quantity * price;
           subtotal += rowtotal;
       }

       totalprice = subtotal;
       lbltprice.Text = totalprice.ToString();
   }

Posted 4-Dec-11 20:08pm

M.Narmatha

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koolprasad2003 · Answer 1 · 2011-12-04T20:26:00

Solution 2

This is a generic error throws by .NET. it occours due to some NULL object.
in above code which line gives you erro ?

Posted 4-Dec-11 20:26pm

koolprasad2003

Eduard Lu · Answer 2 · 2011-12-04T20:12:00

Solution 1

See Solution 1 my friend.

Object reference not set to an instance of an object.[^]

Regards,
Eduard

Posted 4-Dec-11 20:12pm

Eduard Lu

koolprasad2003 · Answer 3 · 2011-12-04T20:56:00

Solution 4

Both your .findControl() methods gives you NULL result. please check your code at that point.

Posted 4-Dec-11 20:56pm

koolprasad2003

raj ch · Answer 4 · 2011-12-04T21:35:00

It occurs when an object refers null. Do u Know on which line it throwing that exception. Check by debugging in these 3 lines.......

C#

int pro_id = Convert.ToInt32(GridView1.DataKeys[row.RowIndex][0]);
          int quantity = Convert.ToInt32((row.FindControl("txtquantity") as TextBox).Text);// Error
          float price = float.Parse((row.FindControl("price")).ToString());

1.If it is in first line then row index is wrong or it returns null value.

2.If it is in second line then txtquantity is not availabe. Remember it is case sensitive.

3.If it is in third line then price is not availabe. Remember it is case sensitive.

akashhh_pre · Answer 5 · 2011-12-04T20:39:00

Solution 3

float price = float.Parse((row.FindControl("price")).ToString());

first u should get the reference of the control then from that reference call the values of that control

Posted 4-Dec-11 20:39pm

akashhh_pre