Data not inserting into database, it shows empty columns in table - asp.net

Question

I have form inside panel and I am inserting data into the database by using a stored procedure from form. It doesn't throw any error, but it is not showing data in the database. Code works successfully but columns in tables are empty.
This is my stored procedure:
CREATE procedure [dbo].[spDREG]
(#pname varchar(250),
#spname varchar(250),
#age int,
#spage int,
#cat varchar(50),
#mno bigint,
#emlid varchar(250),
#years varchar(50)
)
AS
BEGIN
DECLARE #dregid INT = ##identity
INSERT INTO DREG(P_NAME, SECP_NAME, AGE, AGET, CAT, MOB_NO, EMAILD, YEARS)
VALUES(#pname, #spname, #age, #spage, #cat, #mno, #emlid, #years)
END
This is my code behind
protected void Dsbtn_click(object sender, EventArgs e)
{
string psname ="spDREG"; ;
con.Open();
SqlCommand cmd = new SqlCommand(psname,con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#pname", TextBox1.Text.ToString());
cmd.Parameters.AddWithValue("#spname", TextBox2.Text.ToString());
cmd.Parameters.AddWithValue("#age", TextBox22.Text.ToString());
cmd.Parameters.AddWithValue("#spage", TextBox24.Text.ToString());
cmd.Parameters.AddWithValue("#cat", DropDownList1.Text.ToString());
cmd.Parameters.AddWithValue("#mno", TextBox4.Text.ToString());
cmd.Parameters.AddWithValue("#emlid", TextBox5.Text.ToString());
cmd.Parameters.AddWithValue("#years", DropDownList2.Text.ToString());
cmd.ExecuteNonQuery();
con.Close();
dreglbl.Text = "You have successfully registered";
}
This is my design part
<asp:Panel runat="server" ID="dan" class="npan" Width="900px" Height="500px">
<h3 style="text-align: center" class="panhed">Please Fill This Form TO Participate(Dance Registration)</h3>
<div id="snam" runat="server" class="nam">
<asp:Label ID="Label2" runat="server" Text="Name of participant:"></asp:Label>
<asp:TextBox ID="TextBox1" CssClass="txtcls" runat="server" TextMode="MultiLine"></asp:TextBox>
<asp:Button ID="addm" class="addbtn" runat="server" autopostback="true" Text="Add member" OnClick="addm_Click" />
</div>
<div id="Div3" runat="server" class="nams">
<asp:Label ID="Label3" runat="server" autopostback="true" Text="Name of 2nd participant:"></asp:Label>
<asp:TextBox ID="TextBox2" CssClass="txtscls" runat="server"></asp:TextBox>
</div>
<div id="Div29" runat="server" class="nams">
<asp:Label ID="Label27" runat="server" Text="Age:"></asp:Label>
<asp:TextBox ID="TextBox22" CssClass="agtxt" placeholder="1st" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox24" CssClass="agstxt" placeholder="2nd" AutoPostBack="true" runat="server"></asp:TextBox>
</div>
<div id="Div2" runat="server" class="cate">
<asp:Label ID="Label4" runat="server" Text="Select Category:"></asp:Label>
<asp:DropDownList runat="server" ID="DropDownList1" Class="drpd" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="22">select</asp:ListItem>
<asp:ListItem Value="Ss">Solo</asp:ListItem>
<asp:ListItem Value="Dd">Duet</asp:ListItem>
<asp:ListItem Value="Gg">Group</asp:ListItem>
</asp:DropDownList>
</div>
<div id="divv" class="mobn" runat="server">
<asp:Label ID="Label5" runat="server" Text="Mobile No:"></asp:Label>
<asp:TextBox ID="TextBox4" CssClass="mobtxt" runat="server"></asp:TextBox>
</div>
<div id="Div6" runat="server" class="eml">
<asp:Label ID="Label6" runat="server" Text="E-Mail:"></asp:Label>
<asp:TextBox ID="TextBox5" CssClass="emtxt" runat="server"></asp:TextBox>
</div>
<div id="Div7" runat="server" class="yer">
<asp:Label ID="Label7" runat="server" Text="Select Year:"></asp:Label>
<asp:DropDownList runat="server" ID="DropDownList2" Class="drpds">
<asp:ListItem>select</asp:ListItem>
<asp:ListItem>First</asp:ListItem>
<asp:ListItem>Second</asp:ListItem>
<asp:ListItem>Third</asp:ListItem>
<asp:ListItem>other</asp:ListItem>
</asp:DropDownList>
</div>
<div id="Div8" runat="server" class="btndiv">
<asp:Button ID="Dsbtn" runat="server" Class="Btncss" Text="Submit" OnClick="Dsbtn_click" />
<asp:Label ID="dreglbl" runat="server" Text="label"></asp:Label>
</div>
</asp:Panel>
Please solve it guys. Thank you