How Can I Change the Data Type of a DataTable Column?

Modify the data type of DataColumn in DataTable

In a DataTable, you may encounter situations where you need to change the data type of a specific column. This guide walks you through the steps of modifying the DataColumn data type.

Suppose you have a DataTable named Table and a column named column whose data type is Double. You want to change column's data type to Int32.

Change data type

However, it is important to note that once the DataTable is populated with data, you cannot directly change the data type of the column. To achieve this you need to employ cloning techniques:

1. Clone DataTable:

<code>DataTable dtCloned = dt.Clone();</code>

2. Change the data type of a column:

<code>dtCloned.Columns[0].DataType = typeof(Int32);</code>

3. Copy data from original table:

To preserve the data in the original table, you need to transfer the rows:

<code>foreach (DataRow row in dt.Rows) 
{
    dtCloned.ImportRow(row);
}</code>

By following these steps, you can effectively change the data type of a DataColumn while retaining the existing data in the DataTable.

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