count number of column in datatable c#

DataTable Sheets = connectionString.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

foreach (DataRow dr in Sheets.Rows)

{

    string sheetStr = dr[2].ToString().Replace("'", "");

    OleDbDataAdapter dataAdapter = new OleDbDataAdapter("select * from [" + sheetStr + "]", connectionString);

    var ds = new DataSet();

    dataAdapter.Fill(ds, "DataTable");

    DataTable data = ds.Tables["DataTable"];

    if (ds.Tables["DataTable"].Rows.Count > 0)

    {

        GetSetUploadExcelData(uploadExl, data, CompanyID, TenantID);

    }

}