Input string not in correct format

Question

I am getting an error : Input string not in correct format , while am clearing the text box, plz help me to rectify this error

if (chkTax.Checked)
            {
                taxAmnt = ((fAuctionProfit *double .Parse ( txtTax.Text.ToString ())) / 100);
            }
            else

Sandeep Singh Shekhawat · Answer

double taxAmt=0.0; double taxAmtvalue = 0.0; bool isValid = double.TryParse(txtTax.Text.ToString() out taxAmtvalue); if(isValid) { taxAmt=taxAmtvalue; } //Now we can use taxAmt fruther in program

Kunal Vaishya · Answer

Try this ////////////////// // Make Sure txtTax.Text is not Null or Character taxAmnt = ((Convert.ToDouble(fAuctionProfit) * Convert.ToDouble( txtTax.Text.ToString())) / 100); //Or taxAmnt = Convert.ToDouble((Convert.ToDouble(fAuctionProfit) * Convert.ToDouble( txtTax.Text.ToString())) / 100);

Santhosh Kumar Jayaraman · Answer

Thats because when you clear textbox  there is an empty string which cannot be parsed to double if (chkTax.Checked) { double Tax; double .TryParse ( txtTax.Text.ToString () out Tax); taxAmnt = ((fAuctionProfit *Tax) / 100); } else