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C# Programming questions specific to the Microsoft C# language. See also the forum Beginning Visual C# to discuss that specific Wrox book and code.
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Old January 13th, 2007, 01:53 AM
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Default How to Add Primery Key value Automatically

Hello..........

i am working on C# Windows From Developemnt.i want to add automatically primary key value in Master and Detail Form.
Please give me idea about this.





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Old October 6th, 2007, 04:39 PM
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Primary Keys are set on the DataTable of the data. Simply get the column and set the .Unique property as true;


//This sets a single column

DataTable dt = new DataTable();
DataColumn dc = new DataColumn("Id");
dc.Unique = true;

dt.Columns.Add(dc);

//This sets several columns

DataTable dt = new DataTable();
DataColumn dc1 = new DataColumn("Id1");
DataColumn dc2 = new DataColumn("Id2");

dt.Columns.Add( dc1);
dt.Columns.Add( dc2);

dt.PrimaryKey = new DataColumn[] {dc1, dc2};

Regards,

Dom
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