In this post We will show how we can display row number in datagrid control using IMultiValueConverter.Let us start with the code.The code shown in the List 1 is used to bind using the IMultiValueConverter and the passing parameter for the binding converter are the binding and parent datagrid control

< DataGridTextColumn Header="Row Number" IsReadOnly="True"> 
          < DataGridTextColumn.Binding> 
               < MultiBinding Converter="{StaticResource rowNumberConverter}"> 
                  < Binding /> 
                  < Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}" /> 
                < /MultiBinding> 
           < /DataGridTextColumn.Binding> 
 < /DataGridTextColumn>

Now in the converter I have simple code to show the row number of the current element which is passed to the converter in first parameter. I have store it in the object type variable. As I don't know what is the type of the first parameter and then I created another parameter of type data grid control and save the second parameter in it. Now in the next statement I have get the Index of the passed parameter in the data grid control and also added 1 in it, as IndexOf will return 0 for the first element. You can see the code in List 2.

public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
{               
Object item = values[0];  
DataGrid grdPassedGrid = values[1] as DataGrid;
int intRowNumber = grdPassedGrid.Items.IndexOf(item) + 1;
return intRowNumber.ToString().PadLeft(2, '0'); 
}
And you can see the Row Number column in the Image 1, I have set the header text of the column to "Row Number", You can changed it to you requirements.
In the Image 1 you can see that I have used the left padding for the row number, as you can see that each row number is padded left by 0 I have used it to 2 values, You can also pass the length of your padding in the parameter of the IMultiValueConverter.