Exception

System.BadImageFormatException: Could not load file or assembly

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Problem – Can’t load assembly When you have one assembly trying to use another assembly, and they don’t have matching bitness (x64 or x86), then you’ll get an exception: either BadImageFormatException or FileLoadException. If your project references another assembly, and the bitness doesn’t match, you’ll get this exception: System.BadImageFormatException: ‘Could not load file or assembly … Read more System.BadImageFormatException: Could not load file or assembly

ArgumentOutOfRangeException: InvalidArgument=Value of 0 is not valid for SelectedIndex

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Problem Let’s say you’re initializing a ComboBox like this: And you get the following exception: System.ArgumentOutOfRangeException: ‘InvalidArgument=Value of ‘0’ is not valid for ‘SelectedIndex’. (Parameter ‘value’)Actual value was 0.’ You’re getting this exception because the DataSource is empty. Solution Are you expecting there to always be data? If you’re expecting there to always be data, … Read more ArgumentOutOfRangeException: InvalidArgument=Value of 0 is not valid for SelectedIndex

C# – Cannot use a lambda expression as an argument to a dynamically dispatched operation

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Problem You are trying to use a lambda expression on a dynamic object and get the following compiler error: Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type. As an example, the following code causes this error: Solution Cast the … Read more C# – Cannot use a lambda expression as an argument to a dynamically dispatched operation

WinForms: How to check if another form is open

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If you’re working on a Windows Forms project and need to know which forms are open, use: This gives you an IEnumerable collection of form objects that are currently open. You can lookup a form by name, by type, or loop through the list. Example scenarios There are many scenarios where you’d want to know … Read more WinForms: How to check if another form is open

SqlTypeException: SqlDateTime overflow

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Problem I am executing a SQL query and trying to set a datetime column to DateTime.MinValue. I’m getting the following exception: System.Data.SqlTypes.SqlTypeException: ‘SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.’ The problem is that DateTime.MinValue is 1/1/0001 12:00:00 AM and the SQL Server DateTime minimum value is 1/1/1753 12:00 AM. Solution … Read more SqlTypeException: SqlDateTime overflow

Visual Studio 2019 – All references say referenced component could not be found

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Problem When I open a C# project in Visual Studio 2019, none of the references are loading. In the error list it says: The referenced component could not be found This usually means you need to restore the Nuget Package. In this case, it’s even showing this for .NET Framework references – such as System.Core. … Read more Visual Studio 2019 – All references say referenced component could not be found

‘CREATE/ALTER PROCEDURE’ must be the first statement in a query batch

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Problem You have a SQL query like this: While executing this you get the following error: ‘CREATE/ALTER PROCEDURE’ must be the first statement in a query batch Solution The error message says it all: the CREATE PROCEDURE statement cannot be executed after other queries in the same batch of queries. The solution is to execute … Read more ‘CREATE/ALTER PROCEDURE’ must be the first statement in a query batch

OpenQA.Selenium.DriverServiceNotFoundException: The chromedriver.exe file does not exist in the current directory

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Problem I’m trying to use Selenium with the ChromeDriver and I’m running into the following exception: Unhandled Exception: OpenQA.Selenium.DriverServiceNotFoundException: The chromedriver.exe file does not exist in the current directory or in a directory on the PATH environment variable. The driver can be downloaded at http://chromedriver.storage.googleapis.com/index.html Solution The simplest solution is to install the Selenium.Chrome.WebDriver nuget … Read more OpenQA.Selenium.DriverServiceNotFoundException: The chromedriver.exe file does not exist in the current directory

OpenQA.Selenium.WebDriverException: Element is not clickable. Other element would receive click.

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Problem I am using Selenium to automate navigating a website. I’m trying to click a button: When I try to click the button it’s throwing the following exception: OpenQA.Selenium.WebDriverException: Element is not clickable. Other element would receive click. The reason this is happening is because Selenium is trying to click the button by its coordinates, … Read more OpenQA.Selenium.WebDriverException: Element is not clickable. Other element would receive click.

How to update UI from another thread

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I often need to be able to run multiple threads and update the UI based on the results. For example, I may need to execute GET requests to 10 different endpoints concurrently, and then report their results in a datagrid as they come back. The problem is you can’t just update the UI from any … Read more How to update UI from another thread