C# .NET - Error: No overload for 'update_function' matches delegate 'System.EventHandler'

Asked By Nor Shahida Mohd Jamail on 12-Sep-06 11:34 PM

Hi,

<asp:DropDownList ID="drptwrDepartment" runat="server" AutoPostBack="true" OnSelectedIndexChanged ="update_function"

DataSource='<%#getDepartmentOptions()%>'

SelectedIndex='<%# GetSelectedIndex(DataBinder.Eval(Container.DataItem, "TWRDEPARTMENT" ),"DepartmentOptions") %>'>

</asp:DropDownList> </td>

protected void update_function(object Sender, DataListCommandEventArgs e)

{

DropDownList drptwrDepartment = (DropDownList)e.Item.FindControl("drptwrDepartment");

DropDownList drpFunction = (DropDownList)e.Item.FindControl("drpFunction");

drpFunction.DataSource = twr.twrUtil.LoadFunctionByDepartment(drptwrDepartment.SelectedValue.ToString());

drpFunction.DataTextField = "FUNCTN_DESC";

drpFunction.DataValueField = "FUNCTN_DESC";

drpFunction.DataBind();

}

   On compliation, it is throwing the below error on line 1
   "No overload for 'update_function' matches delegate 'System.EventHandler'"

   why the error occured and how to solve it...Thank You

Sushila Patel replied to Nor Shahida Mohd Jamail on 12-Sep-06 11:39 PM

should be

protected void update_function(object Sender, EventArgs e)

'System.EventArgs' does not contain a definition for 'Item'

Nor Shahida Mohd Jamail replied to Sushila Patel on 12-Sep-06 11:56 PM

Cannot recognize the DataListCommandEventArgs for dropdownlist. The update_function is for OnSelectedIndexChange. How to function value when select the department (autoPostBack). Thank You

protected void update_function(object Sender, EventArgs e)

{

DropDownList drptwrDepartment = (DropDownList)e.Item.FindControl("drptwrDepartment");

DropDownList drpFunction = (DropDownList)e.Item.FindControl("drpFunction");

drpFunction.DataSource = twr.twrUtil.LoadFunctionByDepartment(drptwrDepartment.SelectedValue.ToString());

drpFunction.DataTextField = "FUNCTN_DESC";

drpFunction.DataValueField = "FUNCTN_DESC";

drpFunction.DataBind();

}

Sushila Patel replied to Nor Shahida Mohd Jamail on 13-Sep-06 12:01 AM

Where in code do you hsve DataListCommandEventArgs

do you have ddl in datalist????

<%# GetSelectedIndex(DataBinder.Eval(Container.DataItem, "TWRDEPARTMENT" ),"DepartmentOptions") %>

ERROR:No overload for 'Update_function' matches delegate ' System.EventHandler'.

Nor Shahida Mohd Jamail replied to Sushila Patel on 13-Sep-06 12:30 AM

Below is the full code. Actually when update the record, the user will select the department at dropdownlist(ArrayList) and then, they will select the function based on the department(OnSelectedIndexChanged). But now the error is like No overload for 'Update_function' matches delegate ' System.EventHandler'. What should i do now. Please help me...Thank You

<asp:DropDownList ID="drptwrDepartment" runat="server" AutoPostBack="true" OnSelectedIndexChanged ="update_function"

DataSource='<%#getDepartmentOptions()%>'

SelectedIndex='<%# GetSelectedIndex(DataBinder.Eval(Container.DataItem, "TWRDEPARTMENT" ),"DepartmentOptions") %>'>

</asp:DropDownList> </td>

public partial class Maintenance_Wafer_Type : System.Web.UI.Page

{

public static OracleDataReader OracleRead = null;

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

LoadWaferType();

}

protected void LoadWaferType()

{

string strSQL = "SELECT RECORD_KEY, TWRDEPARTMENT, WAFERTYPE, TWRFUNCTION FROM TWRWAFERTYPE ORDER BY TWRDEPARTMENT";

try

{

OracleRead = twr.OracleHelper.ExecuteReader(twr.twrUtil.ConStr(), CommandType.Text, strSQL);

OracleDataReader dtrList2 = OracleRead;

dlstWaferType.DataSource = dtrList2;

dlstWaferType.DataBind();

}

catch (Exception exp)

{

twr.ErrorLog.WriteError(exp.ToString());

}

protected void update_function(object Sender, DataListCommandEventArgs e)

{

DropDownList drptwrDepartment = (DropDownList)e.Item.FindControl("drptwrDepartment");

DropDownList drpFunction = (DropDownList)e.Item.FindControl("drpFunction");

drpFunction.DataSource = twr.twrUtil.LoadFunctionByDepartment(drptwrDepartment.SelectedValue.ToString());

drpFunction.DataTextField = "FUNCTN_DESC";

drpFunction.DataValueField = "FUNCTN_DESC";

drpFunction.DataBind();

}

protected void WaferType_EditCommand(object Source, DataListCommandEventArgs e)

{

lblMessage.Text = "";

dlstWaferType.EditItemIndex = (int)e.Item.ItemIndex;

protected ArrayList getDepartmentOptions()

{

ArrayList arrList = new ArrayList();

try

{

string strSQL = "SELECT DISTINCT(DEPT_DESC) FROM HTRNADM.SM_DEPT_FUNCT_VIEW ORDER BY DEPT_DESC";

OracleRead = twr.OracleHelper.ExecuteReader(twr.twrUtil.ConStrPplsoft(), CommandType.Text, strSQL.ToString());

}

catch (Exception e)

{

Trace.Write(e.Message.ToString());

}

while (OracleRead.Read())

{

arrList.Add(OracleRead["DEPT_DESC"]);}

OracleRead.Close();

Application.Add("DepartmentOptions", arrList);

return arrList;

}

protected ArrayList getFunctionOptions(object selectedValue, string optionName)

{

ArrayList options = (ArrayList)Application.Get(optionName);

int index = options.IndexOf(selectedValue.ToString());

ArrayList arrList2 = new ArrayList();

try

{

string strSQL = "SELECT FUNCTN_DESC FROM HTRNADM.SM_DEPT_FUNCT_VIEW WHERE DEPT_DESC='" + options[index] + "'";

OracleRead = twr.OracleHelper.ExecuteReader(twr.twrUtil.ConStrPplsoft(), CommandType.Text, strSQL.ToString());

}

catch (Exception e)

{

Trace.Write(e.Message.ToString());

}

while (OracleRead.Read())

{

arrList2.Add(OracleRead["FUNCTN_DESC"]);

}

OracleRead.Close();

Application.Add("FunctionOptions", arrList2);

return arrList2;

}

protected int GetSelectedIndex(object selectedValue, string optionName)

{

ArrayList options = (ArrayList)Application.Get(optionName);

int index = options.IndexOf(selectedValue.ToString());

return index;

}

protected int GetSelectedIndex2(object selectedValue, string optionName)

{

ArrayList options = (ArrayList)Application.Get(optionName);

int index = options.IndexOf(selectedValue.ToString());

return index;

}

protected void WaferType_UpdateCommand(object Source, DataListCommandEventArgs e)

{

string itemKey = dlstWaferType.DataKeys[(int)e.Item.ItemIndex].ToString();

DropDownList drptwrDepartment = (DropDownList)e.Item.FindControl("drptwrDepartment");

TextBox TxtWaferType = (TextBox)e.Item.FindControl("TxtWaferType");

Label lblDepartment = (Label)e.Item.FindControl("lblDepartment");

Label lblWaferType = (Label)e.Item.FindControl("lblWaferType");

string sUser = twr.twrUtil.GetSessionUserName();

int exist = 0;

string strMsg = string.Empty;

string strChkExistSQL = "SELECT COUNT(*) TWRTOOLS WHERE TWRDEPARTMENT = '" + lblDepartment +

"' AND RECORD_KEY <> " + itemKey.ToString();

if (exist == 1)

{

strMsg = drptwrDepartment + " already exists. Please disable the existing record to enter new value.";

}

else if (exist == 0)

{

string strSQL = "UPDATE TWRWAFERTYPE SET TWRDEPARTMENT = '" + drptwrDepartment.SelectedValue.ToString() +

"', WAFERTYPE = '" + TxtWaferType.Text.ToString() + "'" +

"WHERE RECORD_KEY= '" + itemKey.ToString() + "'";

OracleConnection con = new OracleConnection(twr.twrUtil.ConStr());

con.Open();

try

{

OracleCommand cmdSelect = con.CreateCommand();

cmdSelect = new OracleCommand(strSQL, con);

cmdSelect.CommandType = CommandType.Text;

cmdSelect.ExecuteNonQuery();

twr.ErrorLog.WriteError("ExecuteNonQuery = " + strSQL.ToString());

strMsg = "Record Updated.";

}

catch (Exception exp)

{

Trace.Write(exp.Message.ToString());

twr.ErrorLog.WriteError("Error inserting record: " + exp.Message.ToString() + strSQL.ToString());

strMsg = exp.Message.ToString();

}

con.Close();

}

lblMessage.Text = strMsg;

dlstWaferType.EditItemIndex = -1;

LoadWaferType();

}

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