Want to link with my local database using xamarin forms

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• I get an error when solving this problem, How can I fix?

  I am trying to solve the Climbstairs problem but in reverse, where I want to know the number of steps I have to take to go down.

  I can go down 1, 2, 3 or 4 steps at the same time. That is, if I am at step i, I can go down to step i - a for any of the values 1, 2, 3 or 4 of a.

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          public static int DownStairs(int n)
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              steps[n] = 1;
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              for (int i = n-2; i>=0; i--)
              {
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              return steps[n];
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          static void Main(string[] args)
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• How to delete multiple blank lines in a WPF DataGrid imported from an Excel file

  I have a WPF DataGrid which I fill with imported data from an Excel file (*. Xlsx) through a class, the problem is that multiple blank lines are added to the end of the DataGrid that I don't see how to delete. I attach my code.

  <DataGrid Name="dgvMuros" Height="210" Margin="8" VerticalAlignment="Top" Padding="5,6" ColumnWidth="50" IsReadOnly="False" 
                                AlternatingRowBackground="Azure" GridLinesVisibility="All"  HeadersVisibility="Column" 
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  public void ImportarMuros()
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          this.dgvMuros.DataContext = dataFronExcel;
          txtTotMuros.Text = dataFronExcel.numMuros.ToString();
  
          cmdAgregarMuros.IsEnabled = false;
          cmdBorrarMuros.IsEnabled = false;
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  public class ExcelData
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      public int numMuros { get; set; }
      public DataView Data
      {
          get
          {
              Excel.Application excelApp = new Excel.Application();
              Excel.Workbook workbook;
              Excel.Worksheet worksheet;
              Excel.Range range;
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              worksheet = (Excel.Worksheet)workbook.Sheets["DatMuros"];
  
              int column = 0;
              int row = 0;
  
              range = worksheet.UsedRange;
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                  for (column = 1; column <= range.Columns.Count; column++)
                  {
                      dr[column - 1] = Convert.ToString((range.Cells[row, column] as Excel.Range).Value);
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              workbook.Close(true, Missing.Value, Missing.Value);
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              return dt.DefaultView;
          }
      }
  }
  
• Microcharts bar chart rendering label

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    private void DrawChart()
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                  monthlyProductCounts.Add(i, productCount);
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              monthlyChartView.Chart = new BarChart
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                  LabelTextSize = 32f,
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  Is it possible to make it so that the label text is not cut-off?
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  Example : Apple card application

  
• Xamarin.Forms: can I declare an interface that has to be a ContentView

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  I'm thinking of something like this, but this itself doesn't work:

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  I've done web searches for this a lot, but I always run into things talking about interface inheritance and subclass conformance, which aren't what I'm after.

  Is there a way to do this?