Coversion from string to double type is invalid

Question

Hi All iam passing a textbox value(the value is 10:1:1) into a string and when iam running the application iam getting the following error coversion from string 10:1:1 to double type is invalid. kindly find the code below and help me on the same: (also the textbox values should be greater than 0 always) Dim strEncrypt As String = txtData.Text If strEncrypt > 0 Then// iam getting the error here txtEncryptedData.Text = Encrypt(strEncrypt) Else MessageBox.Show( Enter the Value greater then 0: ) End If Thanks Rams

Vulpes · Answer

Incidentally you won't be able to convert a string such as 10:1:1 directly to a double as it's really 3 numbers separated by colons. You could split the string first and then convert each element to a double: Dim elements As String() = strEncrypt.Split(:c) Dim d As Double = Double.Parse(elements(0)) MessageBox.Show(d.ToString()) ' 10

Rams · Answer

Here is the solution that worked for me : Function Check(ByVal strEncrypt As String) As Boolean Dim parts As String() parts = strEncrypt.Split(:) If parts.Length = 0 Then Check = False Else Check = True For Each sval As String In parts Check = Check And Int32.Parse(sval) > 0 Next End If End Function

Mamta M · Answer

Great to hear that. Rams can you post the final solution so that it may help other members too?

Rams · Answer

Thank you all i got it solved. Thanks a lot vulpes it worked for me

Prabhu Raja · Answer

Hi i agree with vulpes its good one. Also try this one. Dim elements As String() = strEncrypt.Split(:c); Dim firstnumber As Double; // Try to use TryParse() you handle Conversion Errors effectively. Your Application will not be disturbed by these kind of errors. bool isConverted = Double.TryParse(elements(0).ToString() out firstnumber ) ; if ( isConverted == true) // Value Converted Successfully Else // Value Conversion failed. MessageBox.Show(d.ToString()); ' 10

Javeed M Shaikh · Answer

Hi Rams If you want to check that the textbox value does not start with 0 than use the following: if (!TextBox1.Text.Trim().StartsWith(0)) { // do your stuff here } Also I am not sure if you can convert value  10:1:1 to double. Please do not forget to mark Accepted Answer.

Rams · Answer

Hi Mamta I tried with If( i want to check that the textbox value does not start with 0 Convert.ToDouble(strEncrypt) > 0) but iam getting the error as Input string was not in a correct format.

Mamta M · Answer

How are you doing this: if (strEncrypt > 0) when actually strEncrypt is a string?? Instead you should write: if (Convert.ToDouble(strEncrypt) > 0)

Coversion from string ""to double type is invalid