DataSource Controls :: Passing Results / Parameters In LINQ

Jan 20, 2010

im new to linq and im having lots of trouble creating complex queries.. My problem mainly is that i am using Linq as a BLL.

i created a dbml (with namespace called DAL) file with 2 tables with a one to many relation. Pop and City. There is a forgien key in pop that points to a city. I also created a class called Pop that inhertis DAL.Pop. Now in my ASPX page, i want to call a function in the Pop class that would retrieve some Pop according to its ID, but i need the city name as well.. Ive been going around this in circles for days. I dont know how to write the Linq syntax and i dont understandd how my function's signature should be like.. I want to recieve a table that i can bind to a Gridview and preferable, specify which coloumns to bind.

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I've been reading around, and it sounds like this is somewhat common, though I'm missing something.

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I have a set of controls on my page, Start Date, End Date, User, Status

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txtLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Last_Name.ToString();

Like that I have large number of controls on my form. I have dought, if I assigned like this, db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Last_Name.ToString(); to every control, then I have set of controls like,

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txtWorkPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).WorkPhone.ToString();
txtCellPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).CellPhone.ToString();
ddlSuffix.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Suffix.ToString();
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txtRelationWithPatient.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Relation.ToString();
txtPhoneNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Phone.ToString();
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txtEmergencyContactNumber.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Emergency_Contact_Phone.ToString();
txtRelation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Relation.ToString();
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txtEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Occupation.ToString();
txtEmployerPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Cell_Phone.ToString();
txtEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Address.ToString();
txtEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_City.ToString();
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txtEmployerZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Zip.ToString();
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txtPExtDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Ext_Date.ToString();
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txtPGEmployerLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Lname.ToString();
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txtPGEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Occupation.ToString();
txtPGEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Address.ToString();
txtPGEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_City.ToString();
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txtPGAuthorization.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Authorization.ToString();
txtPGAob.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_AOB.ToString();
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txtSGMI.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_MI.ToString();
txtSGBirthGDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Dob.ToString();
txtSGAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Address.ToString();
txtSGCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_City.ToString();
ddlSGState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_State.ToString();
txtSGZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Zip.ToString();
txtSGEmployerFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Fname.ToString();
txtSGEmployerLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Lname.ToString();
txtSGEmployerPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Phone.ToString();
txtSGEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Occupation.ToString();
txtSGEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Address.ToString();
txtSGEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_City.ToString();
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My question is that, for each control the Stored Procedure called or not? If it is yes then it is time consuming and I need to use LINQ to DataSet or LINQ to Object rather than to call SP for each control. What is difference between LINQ to DataSet and LINQ to Object?

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It seems like this would be fairly straight forward. I've got a gridview that loads up using one stored proc, but I've got a searchbox to filter the grid, and when the user enters some criteria I want to use a different proc to return the results. Something tells me I should be doing this with one procedure, but I can't seem to make that work either. When the form loads, my grid is populated. And if I leave my search criteria blank and search anyway, my grid is still populated correctly. But if I enter search creteria, I get diddley squat. What gives? Here is the relevent snippets.


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