Delete query in stored procedure

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C#

stored-procedure

aspx code
if (e.CommandName == "delete")
{

Button btn = (Button)e.CommandSource;
GridViewRow grdrow = ((GridViewRow)btn.NamingContainer);
int empid = Convert.ToInt32(GridView1.DataKeys[grdrow.RowIndex].Values["id"].ToString());
//string str = "delete from text where id=" + empid + "";
// string str = "delete From Employee where id=" + empid + "";
cmd = new SqlCommand("deleteFromTable", con);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter sp1 = cmd.Parameters.AddWithValue("@empid",empid);
con.Open();
// cmd = new SqlCommand(str, con);
cmd.ExecuteNonQuery();
Response.Write("<script>alert('Record deleted secussfully...')</script>");
con.Close();
Show();

}

storedprocedure

Use Test
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <author,,name>
-- Create date: <create>
-- Description: <description,,>

Create Procedure [dbo].[deleteFromTable]
@FirstName varchar(50),
@MiddleName varchar(50),
@LastName varchar(50),
@empid int
As
Begin
Delete from Employee where id=@empid
End

What I have tried:

on delete it says @FirstName parameter is required which is not supplied