User-1171043462 posted
Reference:
Read and Import Excel Sheet using ADO.Net and C#
First Read the Schema of Excel file
connExcel.Open();
DataTable dtExcelSchema;
dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
connExcel.Close();
Then get the default Sheet name
string sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"];
Then use in query
string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
OleDbCommand command = new OleDbCommand("select * from [" + SheetName + "]", connection);