SQL MDF Database every cell displays: "System.__ComObject" - asp.net

Question

When I execute this program the Excel part generates and string array: cellValue just fine.
When it inserts into the SQL MDF Database: MDFExcel every cell displays: "System.__ComObject".
How do you display the string value instead of the "System.__ComObject"?
protected void Button1_Click(Object sender, EventArgs e)
{
DataSet ds = new DataSet();
//From Excel
Microsoft.Office.Interop.Excel.Application exlApp = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook exlWb = exlApp.Workbooks.Open(#"C:\Users\Optiplex760\Documents\a Excel\ExcelToMDF.xls");
Microsoft.Office.Interop.Excel.Worksheet exlWs= exlWb.Sheets["Sheet1"];
Microsoft.Office.Interop.Excel.Range usedRange = exlWs.UsedRange;
int col = Convert.ToInt32(usedRange.Columns.Count);
int row = Convert.ToInt32(usedRange.Rows.Count);
exlApp.Visible = true;
string[,] cellValue = new string[row + 1, col + 1];
for (int j = 1; j <= row-1; j++)
{
for (int k = 1; k <= col-1; k++)
{
cellValue[j, k] = exlWs.Cells[j+1,k+1].ToString();
}
}
exlWb.Close();
exlWs = null;
exlWb = null;
exlApp.Quit();
exlApp = null;
//To MSSQL
String connStr, cmdStr;
connStr = ConfigurationManager.ConnectionStrings["MDFExceldb"].ConnectionString;
for (int h = 1; h<row; h++)
{
cmdStr = "INSERT INTO [Table1] (col1,col2,col3) VALUES (#col1,#col2,#col3);";
try
{
using (SqlConnection conn = new SqlConnection(connStr))
{
using (SqlCommand cmd = new SqlCommand(cmdStr, conn))
{
conn.Open();
cmd.Parameters.AddWithValue("#col1", cellValue[1, h]);
cmd.Parameters.AddWithValue("#col2", cellValue[2, h]);
cmd.Parameters.AddWithValue("#col3", cellValue[3, h]);
cmd.ExecuteNonQuery();
conn.Close();
cmd.Dispose();
conn.Dispose();
}
}
}
catch (Exception ex)
{
Label2.Text = ex.ToString();
}
}
}

Answer 1

Worksheet.Cells returns a Range and not a single value - and a Range (an RCW object) does not implemented a sensible ToString; thus it defaults to the "System.__ComObject" value shown.
Use the Text property of the Range, eg.
cellValue[j, k] = Convert.ToString(exlWs.Cells[j+1,k+1].Text);
While this should fix the immediate problem, it is also an inefficient process. See this response (using the Value/Value2 property) for how to access the Range values as a 2-dimensional array and reduce excessive range-slicing.