this is the code that i used....
Private Sub butSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles butSearch.Click
SearchCriteria()
End Sub
Private Sub SearchCriteria()
'gets the required information based on the search criteria.
Dim SqlReader As SqlDataReader
Dim retry As Integer
Dim isConnected As Boolean
Dim parmResult As New SqlParameter
Dim blnIsError As Boolean = False
isConnected = True
If OpenConnection() = False Then
For retry = 1 To 3 Step 1
If OpenConnection() = True Then
isConnected = True
Exit For
Else
isConnected = False
End If
Next
End If
IRSComm.CommandText = "proc_search_criteria"
IRSComm.CommandType = CommandType.StoredProcedure
IRSComm.CommandTimeout = 600
IRSComm.Parameters.Clear()
If CBCategory.Checked = True Then
IRSComm.Parameters.Add("@Category", System.Data.SqlDbType.VarChar)
IRSComm.Parameters("@Category").Value = DListCategory.SelectedValue
End If
If CBImpact.Checked = True Then
IRSComm.Parameters.Add("@Impact", System.Data.SqlDbType.VarChar)
IRSComm.Parameters("@Impact").Value = DListImpact.SelectedValue
End If
If CBDtRange.Checked = True Then
IRSComm.Parameters.Add("@from_dt", System.Data.SqlDbType.DateTime)
IRSComm.Parameters.Add("@to_dt", System.Data.SqlDbType.DateTime)
If txtDtFrom.Text <> "" Then
IRSComm.Parameters("@from_dt").Value = txtDtFrom.Text
Else
IRSComm.Parameters("@from_dt").Value = System.DateTime.Now.ToString
End If
If txtDtTo.Text <> "" Then
IRSComm.Parameters("@to_dt").Value = txtDtTo.Text
Else
IRSComm.Parameters("@to_dt").Value = System.DBNull.Value
End If
End If
With parmResult
.DbType = DbType.String
.Value = System.DBNull.Value
.Direction = ParameterDirection.Output
End With
IRSComm.Parameters.Add(parmResult)
Try
IRSComm.ExecuteNonQuery()
blnIsError = False
Catch ex_sql As SqlException
blnIsError = True
msglbl.Text = ex_sql.Message
Catch ex As Exception
blnIsError = True
msglbl.Text = ex.Message
End Try
CloseConnection()
'if the search is executed then the results that are obtained are displayed on the result.aspx page
If blnIsError = False Then
Response.Redirect("results.aspx?result=" & parmResult.Value)
End If
End Sub
please help i don't understand this error. i am passing parameters to a stored procedure to search for the criteria as defined by the parameters and this is the error that i get:
