Cannot Convert String to Type 'Double' is Not Valid in VB.NET

Introduction:

Here I will explain how to solve the problem of “cannot convert string to type 'Double' is not valid” in vb.net. To solve this problem we need to use ‘&’ or ‘CStr’ formats in string while assigning integer values to string in vb.net.

Description:

In previous posts I explained save files in folder and download in asp.net, read or write text file in asp.net, upload and download files from database in asp.net, download multiple files as zip folder in asp.net and many articles relating to solve errors in asp.net, SQL Server, IIS, etc. Now I will explain how to solve the problem of “cannot convert string to type 'Double' is not valid” in vb.net.

In one application when I tried to concatenate string value with integer values in vb.net  that time I got error like as shown below

Actually in vb.net we need to use ‘&’ or ‘CStr’ operators instead of ‘+’ operator for concatenation. We can follow different type methods to fix this problem in vb.net

Method 1:

lblMsg.Text = "Your Password Wrong you have only " & (3 - attempts) & " attempts"

Method 2:

lblMsg.Text = "Your Password Wrong you have only " + CStr(3 - attempts) + " attempts"

Method 3:

lblMsg.Text = String.Format("Your Password Wrong you have only {0} attempts", (3 - attempts))

I hope it helps you to solve your problem. Happy Coding……

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