Remove Spacing Between Paragraphs in Address Blocks

1. Create the Document and List the Lines

Start a new WordDocument and collect the lines you want stacked together.

WordDocument doc = new WordDocument();
string[] addressLines =
{
   "Max Mustermann",
   "Musterstraße 42",
   "12345 Musterstadt",
   "Deutschland"
};

WordDocument doc = new WordDocument();
string[] addressLines =
{
   "Max Mustermann",
   "Musterstraße 42",
   "12345 Musterstadt",
   "Deutschland"
};

Dim doc As New WordDocument()
Dim addressLines As String() = {
    "Max Mustermann",
    "Musterstraße 42",
    "12345 Musterstadt",
    "Deutschland"
}

2. Apply an Exact Line-Spacing Rule to Each Paragraph

For each line, build a Paragraph and set its LineSpacing to a LineSpacing object using the Exact rule. This gives every line a fixed height and removes the inter-line gap.

foreach (string line in addressLines)
{
    Paragraph para = new Paragraph(new TextContent(line));
    para.LineSpacing = new IronSoftware.Abstractions.Word.LineSpacing()
    {
        LineSpacingRule = IronSoftware.Abstractions.Word.LineSpacingRules.Exact,
    };
    doc.AddParagraph(para);
}

foreach (string line in addressLines)
{
    Paragraph para = new Paragraph(new TextContent(line));
    para.LineSpacing = new IronSoftware.Abstractions.Word.LineSpacing()
    {
        LineSpacingRule = IronSoftware.Abstractions.Word.LineSpacingRules.Exact,
    };
    doc.AddParagraph(para);
}

Dim para As Paragraph
For Each line As String In addressLines
    para = New Paragraph(New TextContent(line))
    para.LineSpacing = New IronSoftware.Abstractions.Word.LineSpacing() With {
        .LineSpacingRule = IronSoftware.Abstractions.Word.LineSpacingRules.Exact
    }
    doc.AddParagraph(para)
Next

The line-spacing types live in the IronSoftware.Abstractions.Word namespace. Available types and properties vary by version, so confirm against the release you are running.

3. Save the Document

doc.SaveAs("address3.docx");

doc.SaveAs("address3.docx");

doc.SaveAs("address3.docx")

If you prefer an explicit value over the Exact rule, para.SpacingBetweenLines = 210 also produces tight spacing.