'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

'ListBox.ObjectCollection' does not contain a definition for 'Cast' and no accessible extension method 'Cast' accepting a first argument of type 'ListBox.ObjectCollection' could be found (are you missing a using directive or an assembly reference?)

The target framework 'netcoreapp3.1-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

The target framework 'net7.0-windows' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

'MaterialMultiLineTextBox' is obsolete: 'Use MaterialMultiLineTextBoxEdit instead'

An expression of type 'int' always matches the provided pattern.

'MaterialMultiLineTextBox' is obsolete: 'Use MaterialMultiLineTextBoxEdit instead'

Avoid inexact read with 'System.IO.Stream.Read(byte[], int, int)' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2022)

'MaterialMultiLineTextBox' is obsolete: 'Use MaterialMultiLineTextBoxEdit instead'

An expression of type 'int' always matches the provided pattern.

'MaterialMultiLineTextBox' is obsolete: 'Use MaterialMultiLineTextBoxEdit instead'

Avoid inexact read with 'System.IO.Stream.Read(byte[], int, int)' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2022)

'MaterialMultiLineTextBox' is obsolete: 'Use MaterialMultiLineTextBoxEdit instead'