Failed to convert parameter value from a Label to a Int32

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C#

ASP.NET

hi, how to solve this?

here, i give coding. i am getting error like failed to convert parameter value from a Label to a Int32, when debegger excutes on ExcuteNonQuery();

protected void utnclcicked(object sender, ImageClickEventArgs e)
{
for (int i = 0; i <= C1GridView1.Rows.Count-1; i++)
{

TextBox tqty1 = (TextBox)C1GridView1.Rows[i].Cells[7].FindControl("num");


TextBox l1= (TextBox)GridView1.Rows[i].Cells[0].FindControl("txtnote");
Label m1= (Label)GridView1.Rows[i].Cells[1].FindControl("lblmaxqty");
Label m2= (Label)GridView1.Rows[i].Cells[2].FindControl("lblminqty");
Label m3= (Label)GridView1.Rows[i].Cells[3].FindControl("lblivtfid");
Label m4= (Label)GridView1.Rows[i].Cells[4].FindControl("code");
Label m5= (Label)GridView1.Rows[i].Cells[6].FindControl("descript");
Label m6= (Label)GridView1.Rows[i].Cells[8].FindControl("lblprice");
Label m7= (Label)GridView1.Rows[i].Cells[8].FindControl("lblmfg");

int s1= Convert.ToInt32(tqty1.Text.ToString().Trim());
string s2= lisname.Text.ToString().Trim();
int s3= Convert.ToInt32( maxqty.Text.ToString().Trim());
int s4= Convert.ToInt32(minqty.Text.ToString().Trim());
int s5= Convert.ToInt32(pid.Text.ToString().Trim());
string s6= lblitem.Text.ToString().Trim();
string s7= des.Text.ToString().Trim();
decimal s8 = Convert.ToDecimal(price1.Text.ToString().Trim());

string s9= mfg1.Text.ToString().Trim();

string s10= Session["password"].ToString();
string s11= Session["LoggedIN"].ToString();
SqlConnection conlist = new SqlConnection(constring);
conlist.Open();

SqlCommand cmd = new SqlCommand("sp_testsp", conlist);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@t1", SqlDbType.NVarChar).Value = s1
cmd.Parameters.Add("@t2", SqlDbType.Int).Value = s2
cmd.Parameters.Add("@t3", SqlDbType.Int).Value = s3
cmd.Parameters.Add("@t4", SqlDbType.Int).Value = s4
cmd.Parameters.Add("@t5", SqlDbType.NVarChar).Value = s5
cmd.Parameters.Add("@t6", SqlDbType.NVarChar).Value = s6
cmd.Parameters.Add("@t7", SqlDbType.Int).Value = s7
cmd.Parameters.Add("@t8", SqlDbType.Decimal).Value = s8
cmd.Parameters.Add("@t9", SqlDbType.NVarChar).Value = s9
cmd.Parameters.Add("@t10", SqlDbType.NVarChar).Value = s10
cmd.Parameters.Add("@t11", SqlDbType.NVarChar).Value = s11
cmd.ExecuteNonQuery();
conlist.Close();


}
}

i am getting value from cells of gridview and converting from lablel, text value into int type and string type and then i am sending those values as parameteres for stored prrocedure "sp_testsp"..

Everthing works fine. while converting label and text to int and string, no error. but, when cursor(debugger) comes to cmd.ExecuteNonQuery() i am getting error follow:

Failed to convert parameter value from a Label to a Int32.

How to solve this ? why It says that failed to convert parameter value from a label to Int32. Help needed.