How to created edit page by calling values inserted by Sp?

Question

Hi every body 

I did one webform for  insertion  details by passing the values using stored procedure to my database .

I want to create an edit page for the same details so when a  user select a recored from gridview it will take him/her  to that recored details for editing (Note: My form has checkboxes ,dropdownmenues,radiobuttons,etc..):
this the code I'm using for insertion in the save button :

 cmd = new SqlCommand("sp_Main_Information", con);
 
   cmd.CommandType = CommandType.StoredProcedure;
 
  cmd.Parameters.AddWithValue("@REG_Date", dt);
  cmd.Parameters.AddWithValue("@NAME", name);
  cmd.Parameters.AddWithValue("@ADDRESS", Address);
  cmd.Parameters.AddWithValue("@YEAR", Year);
  cmd.Parameters.AddWithValue("@CURRENT_GPA ", gpa);
  cmd.Parameters.AddWithValue("@ATTCH_ID1", img1);
  cmd.Parameters.AddWithValue("@ATTCH_ID2 , img2);
  cmd.Parameters.AddWithValue("@REMARKS", remarks.Text);
 
  dr = cmd.ExecuteReader();
  dr.Read();
 
 int xx = int.Parse(dr[0].ToString());
  Response.Write(xx);
 
 for (i = 0; i < chktype.Items.Count; i++)
  {
 if (chktype.Items[i].Selected == true)
  {
  cmd = new SqlCommand();
  cmd.CommandText = "insert into tblItemstb values ('" + chktype.Items[i].Text + "'," + xx + ")";
  cmd.Connection = con;
  cmd.ExecuteNonQuery();
  }
 
  }
 
  dr.Close();
  cmd.ExecuteNonQuery();
 
  dr = cmd.ExecuteReader();
  dr.Read();
 
 int yy = int.Parse(dr[0].ToString());
  Response.Write(yy);
 
 for (i = 0; i < chkoption.Items.Count; i++)
  {
 if (chkoption.Items[i].Selected == true)
  {
  cmd = new SqlCommand();
  cmd.CommandText = "insert into tbloptions values ('" + chkoption.Items[i].Text + "'," + yy + ")";
  cmd.Connection = con;
  cmd.ExecuteNonQuery();
  }
 
  }
 
  dr.Close();
  cmd.ExecuteNonQuery();
 
  con.Close();
            lbldone.Text = "Record Added Successfully!";
 
  }
 
  }

can anybody help me in how to Create Edit Form with the same format of the insertion form . :(