Determine the maximum number of rows and the maximum number of columns in an Excel table

How to determine the maximum number of rows and the maximum number of columns in an Excel table? Based on the first problem, if there is a cell across rows and columns in the middle, there is a null value, and the maximum number of rows and columns cannot be determined simply through a loop.
Dim xlworksheet as Excel. worksheet = xlapp. activeworkbook. activeworksheet
Dim introws as integer = xlworksheet. usedrange. Rows. Count
Dim intcols as integer = xlworksheet. usedrange. Columns. Count

 
Usedrange is the region you are using. Contains the rows and columns across the center.
Introws and intcols are the largest row and column you want.