Excel Loading Problem

Hi All….I am new in vb.net.I have a problem while loading the excel sheet into my grid..
I have 14 columns in my excel sheet.One of the columns in my excel sheet has mixed data type. due to which i am un able to load the grid with all the values..I have even set the “IMEX=1” property in connection string,even then it does not work.Can anyone help me out in this.I am working on windows application(VB.NET 2005)