Hi I Want To Compare Two Text Box Values, Validate Two Textboxes In C# Windows Forms

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Hi i want to compare two text box values, validate two textboxes in c# Windows Forms

ex:
fromtxt1 = 500000
Totxt2 = 600000

validate these textboxes, deos not allow totxt value smaller than Fromtxt value

Posted 17-Aug-15 19:42pm

Sathish km

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Comments

Michael_Davies 18-Aug-15 2:21am

Assuming you have made certain that only numbers allowed in the text boxes...Cast or convert the text box text to numeric and test.

sreeyush sudhakaran 18-Aug-15 2:22am

int TotxtValue = Convert.ToInt32(Totxt2.Text);
int fromtxtValue = Convert.ToInt32(fromtxt1.Text);

if(TotxtValue < fromtxtValue )
{
//Give your Validation Error Message Here
}

Sathish km 18-Aug-15 2:55am

private void etxtFromVoucherNo_TextChanged(object sender, EventArgs e)
{
//decimal FromVouNo = decimal.Parse(etxtFromVoucherNo.Text);
//decimal ToVouNo = decimal.Parse(etxtToVoucherNo.Text);

//if (FromVouNo <= ToVouNo)
//{
// etxtFromVoucherNo.Text = FromVouNo.ToString();
//}
//else
//{
// MessageBox.Show("From Voucher Number should be smaller than or equal to To Voucher Number", "Error");
//}
int ValueTo = Convert.ToInt32(etxtToVoucherNo.Text);
int ValueFrom = Convert.ToInt32(etxtFromVoucherNo.Text);

if (ValueFrom > ValueTo)
{
MessageBox.Show("From Voucher Number should be smaller than or equal to To Voucher Number", "Error");
}
}

Sathish km 18-Aug-15 2:55am

getting error "Input string was not in a correct format. "

Sathish km 18-Aug-15 4:32am

again It comes

Sathish km 18-Aug-15 4:33am

private void etxtFromVoucherNo_TextChanged(object sender, EventArgs e)
{
int ValueTo = Convert.ToInt32(etxtToVoucherNo.Text);
int ValueFrom = Convert.ToInt32(etxtFromVoucherNo.Text);

if (ValueFrom > ValueTo)
{
MessageBox.Show("From Voucher Number should be smaller than or equal to To Voucher Number", "Error");
}
}

private void etxtToVoucherNo_TextChanged(object sender, EventArgs e)
{
int ValueTo = Convert.ToInt32(etxtToVoucherNo.Text);
int ValueFrom = Convert.ToInt32(etxtFromVoucherNo.Text);

if (ValueTo < ValueFrom)
{
MessageBox.Show("To Voucher Number should be greater than or equal to From Voucher Number", "Error");
}
}

Sathish km 18-Aug-15 4:33am

i tried like this. what problem in this code?

2 solutions

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Sanket Saxena · Answer 1 · 2015-08-17T20:27:00

Solution 1

Convert it into INT and then compare it wherever you want like OnClick of the button or OnTextChanged event etc.

Example:

C#

int ValueTo= Convert.ToInt32(Totxt2.Text);
int ValueFrom = Convert.ToInt32(fromtxt1.Text);
private void ValueFrom_TextChanged(object sender, EventArgs e)
{
   try
   {
      if(ValueTo < ValueFrom )
      {
         //Message here
      }
   }
   catch
   {
      // If there is an error
   }
}

Posted 17-Aug-15 20:27pm

Sanket Saxena

Updated 17-Aug-15 21:09pm

v3

Comments

Sathish km 18-Aug-15 2:54am

Input string was not in a correct format. When I entered into textbox.I have written in etxt_TextChanged() event is it correct?

Sanket Saxena 18-Aug-15 3:10am

i created a textchange event
Seems your textbox value is null or not converting into INT.
Debug it and check the textboxes value

CPallini · Answer 2 · 2015-08-17T20:33:00

Solution 2

As suggested, convert the strings into numeric values and the compare the latters, e.g.

C#

bool validate()
{
  int f, t;
  if ( int.TryParse(fromtxt1, out f) == false || int.TryParse(Totxt2, out t) == false )
    return false;

  return (f <= t);
}

Posted 17-Aug-15 20:33pm

CPallini