I am trying to populate Amount text field auto

Tayyab Jatoi

I have setup already

"When i select the item the Rate populates automaticaly"

Trying to Engineer?

As ItemName and Rate is populated in if i enter the Quantity Manualy with Leave event of Quantity Text box it should pouplate the Amount of the item automaticaly i have write the code but its not happening i put the breakpoint its going to

try

{

amountValue.Text = Convert.ToString(Convert.ToInt32(salePrice.Text) * Convert.ToInt32(qtyValue.Text));

}

but after that its entering to

catch(Exception ex)

{

MessageBox.Show("Error");

and giving me Error dialog box

try please let me know if i am making any mistake.

6 Replies

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Thiyagarajan E7y ago
Accepted answer
Hi,

I think it may be an empty string error.

So please use the below code
private void txtQuntity_Leave(object sender, EventArgs e)
      {
          try
          {
              decimal rate = Convert.ToDecimal(txtRate.Text==string.Empty?"0":txtRate.Text);
              decimal quantity = Convert.ToDecimal(txtQuntity.Text == string.Empty ? "0" : txtQuntity.Text);

              txtAmount.Text = Convert.ToString(rate * quantity);
          }
          catch (Exception ex)
          {
              MessageBox.Show(ex.Message);
          }
      }
And also call the same leave event for Rate and Quantity text boxes.
Tayyab Jatoi7y ago
Thanks Thiyagarajan...
Suraj Kumar7y ago
Check with the below forum post hope this will help you

https://www.c-sharpcorner.com/Forums/after-selecting-an-item-in-dropdownlist-in-dynamic-gridview
Jignesh Kumar7y ago
Hi Tayyab,

Glad to know it helped you ...
Tayyab Jatoi7y ago
Thank You Jignesh It worked....
Jignesh Kumar7y ago
Hi Tayyab,

Please use below code to check string is null or not becasue you are doing conversion from string to int so its alwasy good to check is null or not else it will throw exception.
try
{

amountValue.Text = Convert.ToString(Convert.ToInt32(string.IsNullOrEmpty(salePrice.Text) ? "0" : salePrice.Text) * Convert.ToInt32(string.IsNullOrEmpty(qtyValue.Text) ? "0" : qtyValue.Text));
}