Move DataGrid Row Up/Down with Sorting

Create two buttons "one for UP" and "one for DOWN" in the datagrid then you can easily move row up and down by using the below code.

Add code in Default.aspx page:

 <asp:DataGrid ID="dgrdAdmin" runat="server" OnItemCommand="dgrdAdmin_ItemCommand"
     AllowSorting="true">
     <Columns>
        <asp:BoundColumn DataField="id" Visible="false"></asp:BoundColumn>
           <asp:TemplateColumn>
              <ItemTemplate>
                 <asp:ImageButton ID="imgbtnUP" runat="server" CommandName="Up" />
                  <asp:ImageButton ID="imgbtnDown" runat="server" CommandName="Down" />
             </ItemTemplate>
          </asp:TemplateColumn>
      </Columns>
  </asp:DataGrid>

Now, Add code in Default.aspx.cs

 private int GetMaxSortOrder()
   {
      int max = 0;
      DataTable dt = new DataTable();
      SqlConnection conn = new SqlConnection("Your_Connection_String");
      SqlCommand cmd = new SqlCommand("SELECT MAX(SORTORDER) FROM Your_Admin_Table");
      conn.Open();
      SqlDataAdapter sqad = new SqlDataAdapter(cmd);
      sqad.Fill(dt);
      if (dt.Rows.Count > 0)
      {
          if (dt.Rows[0][0].ToString() != "")
          max = Convert.ToInt32(dt.Rows[0][0]);
      }
    return max;
    }


protected void dgrdAdmin_ItemCommand(object sender, DataGridCommandEventArgs e)
{
   if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
     {
       if (e.CommandName.Equals("Up"))
       {
          int SortOrder = 0;
          SqlConnection conn = new SqlConnection("Your_Connection_String");
           if (e.Item.Cells[10].Text != "")
            {
              SortOrder = Convert.ToInt32(e.Item.Cells[10].Text);
              if (SortOrder == 0)
                {
                  DataTable dt = new DataTable();
                  SqlCommand cmd = new SqlCommand("SELECT id FROM Your_ADMIN_Table");
                  conn.Open();
                  SqlDataAdapter sqad = new SqlDataAdapter(cmd);
                  sqad.Fill(dt);
                  if (dt.Rows.Count > 0)
                  {
                    int count = 0;
                    foreach (DataRow dr in dt.Rows)
                    {
                     count++;
                     SqlCommand cmdUp = new SqlCommand("UPDATE Your_ADMIN_Table SET 
                                        SortOrder='" + count + "' WHERE id='" + dr["id"].ToString() + "'");
                     cmdUp.ExecuteNonQuery();
                    }
                  }
                   // bind your grid
                   return;
               }
            }
           if (SortOrder == GetMaxSortOrder() || SortOrder > GetMaxSortOrder())
           return;
           SqlCommand cmd2 = new SqlCommand("UPDATE Your_ADMIN_Table SET 
              SortOrder='" + SortOrder + "' WHERE SortOrder='" + (SortOrder + 1) + "'");
           cmd2.ExecuteNonQuery();
           SqlCommand cmd3 = new SqlCommand("UPDATE Your_ADMIN_Table SET 
           SortOrder='" + (SortOrder + 1) + "' WHERE id='" + e.Item.Cells[1].Text + "' AND 
                                          SortOrder='" + SortOrder + "'");
           cmd3.ExecuteNonQuery();
           dgrdAdmin.DataSource = // Bind data in datagrid
           dgrdAdmin.DataBind();
         }
        if (e.CommandName.Equals("Down"))
        {
          SqlConnection conn = new SqlConnection("Your_Connection_String");
          int SortOrder = 0;
          if (e.Item.Cells[10].Text != "")
           {
             SortOrder = Convert.ToInt32(e.Item.Cells[10].Text);
             if (SortOrder == 0)
             {
               DataTable dt = new DataTable();
               SqlCommand cmd = new SqlCommand("SELECT id FROM Your_ADMIN_Table");
               conn.Open();
               SqlDataAdapter sqad = new SqlDataAdapter(cmd);
               if (dt.Rows.Count > 0)
               {
                 int count = 0;
                 foreach (DataRow dr in dt.Rows)
                 {
                   count++;
                   SqlCommand cmdDown = new SqlCommand("UPDATE Your_ADMIN_Table SET 
                                           SortOrder='" + count + "' WHERE id='" + dr["id"].ToString() + "'");
                   cmdDown.ExecuteNonQuery();
                  }
               }
              // bind your grid
                 return;
           }
       }
        if (SortOrder == 0)
        return;
       SqlCommand cmd1 = new SqlCommand("UPDATE Your_ADMIN_Table SET SortOrder=
                                     " + SortOrder + "' WHERE SortOrder='" + (SortOrder - 1) + "'");
       cmd1.ExecuteNonQuery();
       SqlCommand cmd2 = new SqlCommand("UPDATE Your_ADMIN_Table SET SortOrder=
                                       '" + (SortOrder - 1) + "' WHERE id='" + e.Item.Cells[1].Text + "' 
                                        AND SortOrder='" + SortOrder + "'");
       cmd2.ExecuteNonQuery();
       dgrdAdmin.DataSource = // Bind data in datagrid
       dgrdAdmin.DataBind();
       }
    }
}

Now you can easily move your datagrid row up and down with sorting.