Notes when importing Excel Data in. net

When importing data from an Excel file to a database, the most common method is to use Provider = Microsoft. Jet. oledb.4.0;
Data Source = D: "demo.xls; extended properties = 'excel 8.0; HDR = yes; IMEX = 1' . However, when a column contains numbers and texts, some data cannot be read. Sometimes, text data cannot be read, and sometimes numeric data cannot be read. Why? In the past, oledb intelligently determined the column type of Excel Based on the data of the first eight rows. When the number of rows of text data> the number of rows of numeric data, the column type is set to text, otherwise it is a number. So what should I do if I want to read all the data? The secret is thatIMEX = 1To read data in import mode.