Hi,
i have added a check box column to the data table
as shown below

childTable.Columns.Add(

"Select", GetType(Boolean))
the check box is displayed with value as selected

how to make the checkbox default selection to not selected????

Try this way:

DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System.Boolean");
column.AllowDBNull = false;
column.Caption = "Select";
column.ColumnName = "Select";
column.DefaultValue = false;

childTable.Columns.Add(column);

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It should not.
How you bind to DatagridView, do you change TrueValue or FalseValue of DataGridViewCheckBoxColumn ?

Try this way:

DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System.Boolean");
column.AllowDBNull = false;
column.Caption = "Select";
column.ColumnName = "Select";
column.DefaultValue = false;

childTable.Columns.Add(column);

---

Please mark the post as answer if it is helpfull to you because it boosts the members to answer more and more.