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ExcelTemplate oXLT = new ExcelTemplate();

3. Open the template file.
The ExcelTemplate object corresponds to a single template file, so a given ExcelTemplate instance can only have one template file open.

oXLT.Open(Page.MapPath("templates\\Hello World.xlsx"));

4. Create a DataBindingProperties object

DataBindingProperties oDataProps = oXLT.CreateDataBindingProperties();

The DataBindingProperties object can be used to change the behavior of how data is imported. For example, if we were importing multiple rows of data, we can use the DataBindingProperties.MaxRows property to limit the number of rows that are imported. In this sample, we won't be changing any of the import properties, but we still need the DataBindingProperties object to bind data.

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string value = DataValueBox.Text.Trim();
oXLT.BindCellData(value, "DataValue", oDataProps);

In this sample, we're pulling the single value from the text box on the web form.
Since we're binding a single value, we use BindCellData() and specify the data marker ID. Note that we need to pass the DataBindingProperties object, even though none of the DataBindingProperties are active.

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oXLT.Process();

ExcelTemplate.Process() handles everything relating to inserting the data into the file. If we were importing multiple rows of data, Process() would handle inserting the new physical rows into the Excel worksheet.

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oXLT.Save(Page.Response, "Output.xlsx", false);

There are several options for ExcelTemplate.Save including: save to disk, save to memory stream, stream back to the client inline, and stream back to the client as an attachment. In this case, we're streaming the workbook back to the client as an attachment.
Also, ExcelWriter does not convert between file formats, so it is important that the file extension on the output file matches the file extension of the original template file.

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using SoftArtisans.OfficeWriter.ExcelWriter;
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ExcelTemplate oXLT = new ExcelTemplate();
oXLT.Open(Page.MapPath("Hello World.xlsx"));
DataBindingProperties oDataProps = oXLT.CreateDataBindingProperties();
string value = DataValueBox.Text.Trim();
oXLT.BindCellData(value, "DataValue", oDataProps);
oXLT.Process();
oXLT.Save(Page.Response, "Output.xlsx", false);