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+---
+layout: post
+title: Merge cells in Blazor Spreadsheet component | Syncfusion
+description: Checkout and learn all about the comprehensive merge functionality in Syncfusion Blazor Spreadsheet component and much more.
+platform: document-processing
+control: Spreadsheet
+documentation: ug
+---
+
+# Merge cells in Blazor Spreadsheet component
+
+Merging cells in the Blazor Spreadsheet component allows you to combine adjacent cells into a single larger cell, improving layout and readability. This feature is commonly used to create headers, section labels, or grouped content for a structured view. To control this functionality, use the [AllowMerge](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.Spreadsheet.SfSpreadsheet.html#Syncfusion_Blazor_Spreadsheet_SfSpreadsheet_AllowMerge) property, which enables or disables merge cell support in the Spreadsheet. The default value of the `AllowMerge` property is true.
+
+N> When `AllowMerge` is set to **`false`**, merge options are **disabled** in the Ribbon. API methods related to merging will also be inactive. Additionally, if the **worksheet is protected**, the merging feature is disabled. For more information, refer to the [Worksheet Protection](./protection#protect-sheet) documentation.
+
+## Merge operations
+
+The Blazor Spreadsheet supports the following merge operations:
+
+| Operation | Description |
+| -- | -- |
+| Merge cells | Combines all selected cells into one single cell. The value from the top-left cell is kept. |
+| Merge & center | Combines all selected cells into one single cell and centers the content horizontally. The value from the top-left cell is kept. |
+| Merge across | Merges cells row by row across columns in the selection. Each row keeps its first cell value. |
+| Unmerge cells | Reverses a merge and restores individual cells. The top-left cell value remains, and other cells are cleared. |
+
+N> The **Merge Cell** button is disabled when a single unmerged cell is selected. Merge options are also unavailable when the sheet is protected.
+
+## Merge Cells
+
+### Merge cells via UI
+
+- Select a range of cells to merge.
+- Click on **Merge Cell** drop-down in the ribbon.
+- Choose one of the following option:
+ - **Merge & Center**
+ - **Merge Across**
+ - **Merge Cells**
+
+
+
+When merging cells through the user interface, a validation dialog is displayed to inform that only the upper-left cell value will be retained and other values will be discarded.
+
+
+
+N> Clicking the **Merge Cells** button (not the drop-down) applies the default action. If the selection is not merged, the cells are merged into a single cell. If the selection includes or intersects a merged range, that merged range is unmerged.
+
+### Merge cells programmatically
+
+The [MergeAsync](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.Spreadsheet.SfSpreadsheet.html#Syncfusion_Blazor_Spreadsheet_SfSpreadsheet_MergeAsync_System_String_System_String_) method merges cells based on the specified merge type. If the **cellRange** parameter is not provided, the current selection is used. This method provides a programmatic way to merge cells without using the UI. The available parameters in the `MergeAsync` method are:
+
+| Parameter | Type | Description |
+| -- | -- | -- |
+| mergeType | **MergeType** | Specifies the merge behavior.
the Default MergeType is `MergeType.Cells`. Supported values: - `Cells` - Merge the entire selection into one cell and preserve the top-left value; - `Center` - Merge the entire selection and horizontally center the resulting cell’s content; - `Across` - For each row in the selection, merge the cells across columns and preserve each row’s first cell value. |
+| cellRange | string (optional) | Specifies the A1-style address of the range to unmerge (e.g., `"A1:D1"`). If not provided, the currently selected range will be unmerged. |
+
+{% tabs %}
+{% highlight razor tabtitle="Index.razor" %}
+
+@using Syncfusion.Blazor.Spreadsheet
+
+
+
+
+
+
+
+
+
+@code {
+ public byte[] DataSourceBytes { get; set; }
+ public SfSpreadsheet SpreadsheetInstance;
+
+ protected override void OnInitialized()
+ {
+ string filePath = "wwwroot/Sample.xlsx";
+ DataSourceBytes = File.ReadAllBytes(filePath);
+ }
+
+ private async Task MergeSelection()
+ {
+ // Merge the current selection into a single cell
+ await SpreadsheetInstance.MergeAsync(MergeType.Cells);
+ }
+
+ private async Task MergeAcrossRange()
+ {
+ // For each row in the range, merge across its columns
+ await SpreadsheetInstance.MergeAsync(MergeType.Across, "C2:E6");
+ }
+
+ private async Task MergeAndCenterRange()
+ {
+ // Merge the range and center-align the merged cell’s content
+ await SpreadsheetInstance.MergeAsync(MergeType.Center, "A1:D1");
+ }
+
+}
+
+{% endhighlight %}
+{% endtabs %}
+
+## Unmerge Cells
+
+### Unmerge cells via UI
+
+- Select a range of cells to unmerge.
+- Click on **Merge Cell** drop-down in the ribbon.
+- Choose **Unmerge cells** option.
+
+
+
+### Unmerge cells programmatically.
+
+The [UnmergeAsync](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.Spreadsheet.SfSpreadsheet.html#Syncfusion_Blazor_Spreadsheet_SfSpreadsheet_UnmergeAsync_System_String_System_String_) method reverses a merge and restores individual cells. If the **cellRange** parameter is not provided, the current selection cell is unmerged. This method provides a programmatic way to unmerge cells without using the UI. The available parameters in the `UnmergeAsync` method are:
+
+| Parameter | Type | Description |
+| -- | -- | -- |
+| cellRange | string (optional) | Specifies the A1-style address of the range to unmerge (e.g., "A1:D1"). If not provided, the currently selected range will be unmerged. |
+
+{% tabs %}
+{% highlight razor tabtitle="Index.razor" %}
+
+@using Syncfusion.Blazor.Spreadsheet
+
+
+
+
+
+
+
+@code {
+ public byte[] DataSourceBytes { get; set; }
+ public SfSpreadsheet SpreadsheetInstance;
+
+ protected override void OnInitialized()
+ {
+ string filePath = "wwwroot/Sample.xlsx";
+ DataSourceBytes = File.ReadAllBytes(filePath);
+ }
+
+ private async Task UnmergeRange()
+ {
+ // Unmerge the specified merged region
+ await SpreadsheetInstance.UnmergeAsync("A1:D1");
+ }
+}
+
+{% endhighlight %}
+{% endtabs %}
+
+### Merge cells validation messages
+
+When perform merge cell in the Blazor Spreadsheet, validation messages are displayed in specific scenarios to inform about merge cell constraints:
+
+- **Sorting with merged cells** - When sorting a range that contains merged cells, a validation dialog appears to indicate that sorting cannot proceed unless all merged cells are consistent in size.
+
+- **Autofill on merged cells** - When performing autofill and dropping the fill handle onto merged cells, a validation dialog appears to indicate that autofill requires all merged cells to be the same size.
+
+These limitations are enforced to maintain data integrity and prevent unexpected behavior during operations like sorting and autofill.
+
+
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