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Why when I click on title header to sort a GridView, some data disappear?

Posted By:      Posted Date: October 25, 2010    Points: 0   Category :ASP.Net

 Hi there

When I click on my GridView header "End Time" all the rows which contain the string "N/A" disappear.
Here is my code:

protected void GridView2_Sorting(object sender, GridViewSortEventArgs e)
FillDataGridView_JobHistory(ViewState["DateBegin"].ToString(), ViewState["DateEnd"].ToString());

Note: GetSortDirection returns "endTime ASC" or "endTime DESC" and save in ViewState:

ViewState["SortDirection_JobHistory"] = sortDirection;
ViewState["SortExpression_JobHistory"] = column;

Then I fill the DataAdapter and use the ViewState info to sort it:

protected void FillDataGridView_JobHistory(string dateBegin, string dateEnd)
string query = "dbo.GetJobHistory";
DataTable dt = new DataTable();
SqlConnection myConnection = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);

SqlCommand cmd = new SqlCommand(query, myConnection);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@dateBegin", SqlDbType.DateTime));
cmd.Parameters.Add(new SqlParameter("@dateEnd", SqlDbTyp

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