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<Solution>
<Project Path="FirstUsedCellInUsedRange/FirstUsedCellInUsedRange.csproj" />
</Solution>
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="Syncfusion.XlsIO.Net.Core" Version="*" />
</ItemGroup>

<ItemGroup>
<None Update="Output\*">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="Data\*">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
</ItemGroup>

</Project>
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using Syncfusion.XlsIO;

namespace FirstUsedCellInUsedRange
{
class Program
{
public static void Main(string[] args)
{
using (ExcelEngine excelEngine = new ExcelEngine())
{
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Xlsx;
IWorkbook workbook = application.Workbooks.Open(Path.GetFullPath(@"Data/Input.xlsx"));
IWorksheet worksheet = workbook.Worksheets[0];

//Get the used range of the worksheet
IRange usedRange = worksheet.UsedRange;

//Get the first cell from the used range
IRange firstCell = worksheet.Range[usedRange.Row, usedRange.Column];

//Get the address of the first cell
string firstCellAddress = firstCell.AddressLocal;

//Display the address of the first cell
Console.WriteLine("The address of the first used cell in used range is: " + firstCellAddress);

//Saving the workbook
workbook.SaveAs(Path.GetFullPath(@"Output/Output.xlsx"));
}
}
}
}