data conversion problem in C#

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Hi All
I am working in C# windows platform where I have to multiply two text box value which is store in a double data type variable below I m give the code

C#

double a=0.00;
//Calculation for Amount
if (txtItemCode.Text != "")
{
     a = float.Parse(txtItemQty.Text);
}
else
{
    double m = double.Parse(txtItemQty.Text);
    double n = double.Parse(txtPrice.Text);

    a = float.Parse(m * n); //here conversion problem started
  //Error: float.Parse(String)has some invalid arguments
}

Please help me to solve the issue

Thanks to All
Indrajit

Posted 12-Sep-11 19:21pm

IndrajitDasgupat

Updated 12-Sep-11 19:42pm

Mehdi Gholam

v2

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CodingLover · Answer 1 · 2011-09-12T19:25:00

Solution 1

As your error explains, parse() expecting a string. Did you read the API?

Did you tried anything such as ,

C#

a = m * n;

Posted 12-Sep-11 19:25pm

CodingLover

Comments

Venkatesh Mookkan 13-Sep-11 2:26am

Good answer!

Roger Wright · Answer 2 · 2011-09-12T20:16:00

I'm having trouble following your business logic. You start out by declaring a variable a as a double. Then you test the txtItemQty value to see if it is blank, and if it is, you immediately recast the type to float and assign it the value of 0.00. Later you clearly indicate that you mean the variable m to hold the value of txtItemQty as a double; why not be consistent?

Let's do this another way:

C#

if (txtItemQty.Text != "")
   {
      double m = double.Parse(txtItemQty.Text);
      double n = double.Parse(txtPrice.Text);
      double k = m*n;
      MessageBox.Show("Your cost is " & k.ToString());
   }
else
   {
      MessageBox.Show("Please enter a quantity and retry.");
   }

Sudhir Kumar Srivastava lko · Answer 3 · 2011-09-12T19:29:00

float.Parse() receive, string as argument pass the variable this way:

C#

double a = 0.00;

          if (txtItemQty.Text != "")
          {
              a = float.Parse(textBox1.Text);
          }
          else
          {
              double m = double.Parse(txtItemQty.Text);
              double n = double.Parse(txtPrice.Text);
              double k = m * n;

              a = float.Parse(k.ToString()); //here conversion problem started
              //Error: float.Parse(String)has some invalid arguments

              MessageBox.Show(a.ToString());

data conversion problem in C#

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