eerhardt commented on pull request #6121:
URL: https://github.com/apache/arrow/pull/6121#issuecomment-729258102
You can use the `XXXArray.Builder` class and the `AppendNull()` method. See
below:
```C#
using Apache.Arrow;
FloatArray.Builder builder = new FloatArray.Builder();
builder.Append(5);
builder.Append(4);
builder.Append(3);
builder.Append(2);
builder.Append(1);
builder.AppendNull();
builder.Append(0);
FloatArray floatArray = builder.Build();
for (int i = 0; i < floatArray.Length; i++)
{
Console.WriteLine(floatArray.GetValue(i));
}
```
produces:
```
5
4
3
2
1
0
```
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